diff --git a/java-client/src/main/java/co/elastic/clients/elasticsearch/_types/ErrorCause.java b/java-client/src/main/java/co/elastic/clients/elasticsearch/_types/ErrorCause.java
index 18f10b4c7..1dbe92c22 100644
--- a/java-client/src/main/java/co/elastic/clients/elasticsearch/_types/ErrorCause.java
+++ b/java-client/src/main/java/co/elastic/clients/elasticsearch/_types/ErrorCause.java
@@ -60,6 +60,7 @@ public class ErrorCause implements JsonpSerializable {
 	@Nullable
 	private final String type;
 
+	@Nullable
 	private final String reason;
 
 	@Nullable
@@ -79,7 +80,7 @@ private ErrorCause(Builder builder) {
 		this.metadata = ApiTypeHelper.unmodifiable(builder.metadata);
 
 		this.type = builder.type;
-		this.reason = ApiTypeHelper.requireNonNull(builder.reason, this, "reason");
+		this.reason = builder.reason;
 		this.stackTrace = builder.stackTrace;
 		this.causedBy = builder.causedBy;
 		this.rootCause = ApiTypeHelper.unmodifiable(builder.rootCause);
@@ -109,10 +110,11 @@ public final String type() {
 	}
 
 	/**
-	 * Required - A human-readable explanation of the error, in english
+	 * A human-readable explanation of the error, in english
 	 * <p>
 	 * API name: {@code reason}
 	 */
+	@Nullable
 	public final String reason() {
 		return this.reason;
 	}
@@ -172,9 +174,11 @@ protected void serializeInternal(JsonGenerator generator, JsonpMapper mapper) {
 			generator.write(this.type);
 
 		}
-		generator.writeKey("reason");
-		generator.write(this.reason);
+		if (this.reason != null) {
+			generator.writeKey("reason");
+			generator.write(this.reason);
 
+		}
 		if (this.stackTrace != null) {
 			generator.writeKey("stack_trace");
 			generator.write(this.stackTrace);
@@ -246,6 +250,7 @@ public final Builder metadata(String key, JsonData value) {
 		@Nullable
 		private String type;
 
+		@Nullable
 		private String reason;
 
 		@Nullable
@@ -271,11 +276,11 @@ public final Builder type(@Nullable String value) {
 		}
 
 		/**
-		 * Required - A human-readable explanation of the error, in english
+		 * A human-readable explanation of the error, in english
 		 * <p>
 		 * API name: {@code reason}
 		 */
-		public final Builder reason(String value) {
+		public final Builder reason(@Nullable String value) {
 			this.reason = value;
 			return this;
 		}
diff --git a/java-client/src/main/java/co/elastic/clients/elasticsearch/_types/aggregations/GeoBoundsAggregate.java b/java-client/src/main/java/co/elastic/clients/elasticsearch/_types/aggregations/GeoBoundsAggregate.java
index 13b853d76..b19f7c5bc 100644
--- a/java-client/src/main/java/co/elastic/clients/elasticsearch/_types/aggregations/GeoBoundsAggregate.java
+++ b/java-client/src/main/java/co/elastic/clients/elasticsearch/_types/aggregations/GeoBoundsAggregate.java
@@ -29,7 +29,6 @@
 import co.elastic.clients.json.JsonpMapper;
 import co.elastic.clients.json.ObjectBuilderDeserializer;
 import co.elastic.clients.json.ObjectDeserializer;
-import co.elastic.clients.util.ApiTypeHelper;
 import co.elastic.clients.util.ObjectBuilder;
 import jakarta.json.stream.JsonGenerator;
 import java.util.Objects;
@@ -46,6 +45,7 @@
  */
 @JsonpDeserializable
 public class GeoBoundsAggregate extends AggregateBase implements AggregateVariant {
+	@Nullable
 	private final GeoBounds bounds;
 
 	// ---------------------------------------------------------------------------------------------
@@ -53,7 +53,7 @@ public class GeoBoundsAggregate extends AggregateBase implements AggregateVarian
 	private GeoBoundsAggregate(Builder builder) {
 		super(builder);
 
-		this.bounds = ApiTypeHelper.requireNonNull(builder.bounds, this, "bounds");
+		this.bounds = builder.bounds;
 
 	}
 
@@ -70,8 +70,9 @@ public Aggregate.Kind _aggregateKind() {
 	}
 
 	/**
-	 * Required - API name: {@code bounds}
+	 * API name: {@code bounds}
 	 */
+	@Nullable
 	public final GeoBounds bounds() {
 		return this.bounds;
 	}
@@ -79,8 +80,11 @@ public final GeoBounds bounds() {
 	protected void serializeInternal(JsonGenerator generator, JsonpMapper mapper) {
 
 		super.serializeInternal(generator, mapper);
-		generator.writeKey("bounds");
-		this.bounds.serialize(generator, mapper);
+		if (this.bounds != null) {
+			generator.writeKey("bounds");
+			this.bounds.serialize(generator, mapper);
+
+		}
 
 	}
 
@@ -93,18 +97,19 @@ protected void serializeInternal(JsonGenerator generator, JsonpMapper mapper) {
 	public static class Builder extends AggregateBase.AbstractBuilder<Builder>
 			implements
 				ObjectBuilder<GeoBoundsAggregate> {
+		@Nullable
 		private GeoBounds bounds;
 
 		/**
-		 * Required - API name: {@code bounds}
+		 * API name: {@code bounds}
 		 */
-		public final Builder bounds(GeoBounds value) {
+		public final Builder bounds(@Nullable GeoBounds value) {
 			this.bounds = value;
 			return this;
 		}
 
 		/**
-		 * Required - API name: {@code bounds}
+		 * API name: {@code bounds}
 		 */
 		public final Builder bounds(Function<GeoBounds.Builder, ObjectBuilder<GeoBounds>> fn) {
 			return this.bounds(fn.apply(new GeoBounds.Builder()).build());
diff --git a/java-client/src/main/java/co/elastic/clients/elasticsearch/_types/analysis/IcuCollationTokenFilter.java b/java-client/src/main/java/co/elastic/clients/elasticsearch/_types/analysis/IcuCollationTokenFilter.java
index 187d5a54e..a11cf5f5a 100644
--- a/java-client/src/main/java/co/elastic/clients/elasticsearch/_types/analysis/IcuCollationTokenFilter.java
+++ b/java-client/src/main/java/co/elastic/clients/elasticsearch/_types/analysis/IcuCollationTokenFilter.java
@@ -28,7 +28,6 @@
 import co.elastic.clients.json.JsonpMapper;
 import co.elastic.clients.json.ObjectBuilderDeserializer;
 import co.elastic.clients.json.ObjectDeserializer;
-import co.elastic.clients.util.ApiTypeHelper;
 import co.elastic.clients.util.ObjectBuilder;
 import jakarta.json.stream.JsonGenerator;
 import java.lang.Boolean;
@@ -47,27 +46,40 @@
  */
 @JsonpDeserializable
 public class IcuCollationTokenFilter extends TokenFilterBase implements TokenFilterDefinitionVariant {
+	@Nullable
 	private final IcuCollationAlternate alternate;
 
+	@Nullable
 	private final IcuCollationCaseFirst casefirst;
 
-	private final boolean caselevel;
+	@Nullable
+	private final Boolean caselevel;
 
+	@Nullable
 	private final String country;
 
+	@Nullable
 	private final IcuCollationDecomposition decomposition;
 
-	private final boolean hiraganaquaternarymode;
+	@Nullable
+	private final Boolean hiraganaquaternarymode;
 
+	@Nullable
 	private final String language;
 
-	private final boolean numeric;
+	@Nullable
+	private final Boolean numeric;
 
+	@Nullable
+	private final String rules;
+
+	@Nullable
 	private final IcuCollationStrength strength;
 
 	@Nullable
 	private final String variabletop;
 
+	@Nullable
 	private final String variant;
 
 	// ---------------------------------------------------------------------------------------------
@@ -75,18 +87,18 @@ public class IcuCollationTokenFilter extends TokenFilterBase implements TokenFil
 	private IcuCollationTokenFilter(Builder builder) {
 		super(builder);
 
-		this.alternate = ApiTypeHelper.requireNonNull(builder.alternate, this, "alternate");
-		this.casefirst = ApiTypeHelper.requireNonNull(builder.casefirst, this, "casefirst");
-		this.caselevel = ApiTypeHelper.requireNonNull(builder.caselevel, this, "caselevel");
-		this.country = ApiTypeHelper.requireNonNull(builder.country, this, "country");
-		this.decomposition = ApiTypeHelper.requireNonNull(builder.decomposition, this, "decomposition");
-		this.hiraganaquaternarymode = ApiTypeHelper.requireNonNull(builder.hiraganaquaternarymode, this,
-				"hiraganaquaternarymode");
-		this.language = ApiTypeHelper.requireNonNull(builder.language, this, "language");
-		this.numeric = ApiTypeHelper.requireNonNull(builder.numeric, this, "numeric");
-		this.strength = ApiTypeHelper.requireNonNull(builder.strength, this, "strength");
+		this.alternate = builder.alternate;
+		this.casefirst = builder.casefirst;
+		this.caselevel = builder.caselevel;
+		this.country = builder.country;
+		this.decomposition = builder.decomposition;
+		this.hiraganaquaternarymode = builder.hiraganaquaternarymode;
+		this.language = builder.language;
+		this.numeric = builder.numeric;
+		this.rules = builder.rules;
+		this.strength = builder.strength;
 		this.variabletop = builder.variabletop;
-		this.variant = ApiTypeHelper.requireNonNull(builder.variant, this, "variant");
+		this.variant = builder.variant;
 
 	}
 
@@ -103,64 +115,81 @@ public TokenFilterDefinition.Kind _tokenFilterDefinitionKind() {
 	}
 
 	/**
-	 * Required - API name: {@code alternate}
+	 * API name: {@code alternate}
 	 */
+	@Nullable
 	public final IcuCollationAlternate alternate() {
 		return this.alternate;
 	}
 
 	/**
-	 * Required - API name: {@code caseFirst}
+	 * API name: {@code caseFirst}
 	 */
+	@Nullable
 	public final IcuCollationCaseFirst casefirst() {
 		return this.casefirst;
 	}
 
 	/**
-	 * Required - API name: {@code caseLevel}
+	 * API name: {@code caseLevel}
 	 */
-	public final boolean caselevel() {
+	@Nullable
+	public final Boolean caselevel() {
 		return this.caselevel;
 	}
 
 	/**
-	 * Required - API name: {@code country}
+	 * API name: {@code country}
 	 */
+	@Nullable
 	public final String country() {
 		return this.country;
 	}
 
 	/**
-	 * Required - API name: {@code decomposition}
+	 * API name: {@code decomposition}
 	 */
+	@Nullable
 	public final IcuCollationDecomposition decomposition() {
 		return this.decomposition;
 	}
 
 	/**
-	 * Required - API name: {@code hiraganaQuaternaryMode}
+	 * API name: {@code hiraganaQuaternaryMode}
 	 */
-	public final boolean hiraganaquaternarymode() {
+	@Nullable
+	public final Boolean hiraganaquaternarymode() {
 		return this.hiraganaquaternarymode;
 	}
 
 	/**
-	 * Required - API name: {@code language}
+	 * API name: {@code language}
 	 */
+	@Nullable
 	public final String language() {
 		return this.language;
 	}
 
 	/**
-	 * Required - API name: {@code numeric}
+	 * API name: {@code numeric}
 	 */
-	public final boolean numeric() {
+	@Nullable
+	public final Boolean numeric() {
 		return this.numeric;
 	}
 
 	/**
-	 * Required - API name: {@code strength}
+	 * API name: {@code rules}
+	 */
+	@Nullable
+	public final String rules() {
+		return this.rules;
+	}
+
+	/**
+	 * API name: {@code strength}
 	 */
+	@Nullable
 	public final IcuCollationStrength strength() {
 		return this.strength;
 	}
@@ -174,8 +203,9 @@ public final String variabletop() {
 	}
 
 	/**
-	 * Required - API name: {@code variant}
+	 * API name: {@code variant}
 	 */
+	@Nullable
 	public final String variant() {
 		return this.variant;
 	}
@@ -184,36 +214,62 @@ protected void serializeInternal(JsonGenerator generator, JsonpMapper mapper) {
 
 		generator.write("type", "icu_collation");
 		super.serializeInternal(generator, mapper);
-		generator.writeKey("alternate");
-		this.alternate.serialize(generator, mapper);
-		generator.writeKey("caseFirst");
-		this.casefirst.serialize(generator, mapper);
-		generator.writeKey("caseLevel");
-		generator.write(this.caselevel);
+		if (this.alternate != null) {
+			generator.writeKey("alternate");
+			this.alternate.serialize(generator, mapper);
+		}
+		if (this.casefirst != null) {
+			generator.writeKey("caseFirst");
+			this.casefirst.serialize(generator, mapper);
+		}
+		if (this.caselevel != null) {
+			generator.writeKey("caseLevel");
+			generator.write(this.caselevel);
 
-		generator.writeKey("country");
-		generator.write(this.country);
+		}
+		if (this.country != null) {
+			generator.writeKey("country");
+			generator.write(this.country);
 
-		generator.writeKey("decomposition");
-		this.decomposition.serialize(generator, mapper);
-		generator.writeKey("hiraganaQuaternaryMode");
-		generator.write(this.hiraganaquaternarymode);
+		}
+		if (this.decomposition != null) {
+			generator.writeKey("decomposition");
+			this.decomposition.serialize(generator, mapper);
+		}
+		if (this.hiraganaquaternarymode != null) {
+			generator.writeKey("hiraganaQuaternaryMode");
+			generator.write(this.hiraganaquaternarymode);
 
-		generator.writeKey("language");
-		generator.write(this.language);
+		}
+		if (this.language != null) {
+			generator.writeKey("language");
+			generator.write(this.language);
 
-		generator.writeKey("numeric");
-		generator.write(this.numeric);
+		}
+		if (this.numeric != null) {
+			generator.writeKey("numeric");
+			generator.write(this.numeric);
+
+		}
+		if (this.rules != null) {
+			generator.writeKey("rules");
+			generator.write(this.rules);
 
-		generator.writeKey("strength");
-		this.strength.serialize(generator, mapper);
+		}
+		if (this.strength != null) {
+			generator.writeKey("strength");
+			this.strength.serialize(generator, mapper);
+		}
 		if (this.variabletop != null) {
 			generator.writeKey("variableTop");
 			generator.write(this.variabletop);
 
 		}
-		generator.writeKey("variant");
-		generator.write(this.variant);
+		if (this.variant != null) {
+			generator.writeKey("variant");
+			generator.write(this.variant);
+
+		}
 
 	}
 
@@ -226,97 +282,118 @@ protected void serializeInternal(JsonGenerator generator, JsonpMapper mapper) {
 	public static class Builder extends TokenFilterBase.AbstractBuilder<Builder>
 			implements
 				ObjectBuilder<IcuCollationTokenFilter> {
+		@Nullable
 		private IcuCollationAlternate alternate;
 
+		@Nullable
 		private IcuCollationCaseFirst casefirst;
 
+		@Nullable
 		private Boolean caselevel;
 
+		@Nullable
 		private String country;
 
+		@Nullable
 		private IcuCollationDecomposition decomposition;
 
+		@Nullable
 		private Boolean hiraganaquaternarymode;
 
+		@Nullable
 		private String language;
 
+		@Nullable
 		private Boolean numeric;
 
+		@Nullable
+		private String rules;
+
+		@Nullable
 		private IcuCollationStrength strength;
 
 		@Nullable
 		private String variabletop;
 
+		@Nullable
 		private String variant;
 
 		/**
-		 * Required - API name: {@code alternate}
+		 * API name: {@code alternate}
 		 */
-		public final Builder alternate(IcuCollationAlternate value) {
+		public final Builder alternate(@Nullable IcuCollationAlternate value) {
 			this.alternate = value;
 			return this;
 		}
 
 		/**
-		 * Required - API name: {@code caseFirst}
+		 * API name: {@code caseFirst}
 		 */
-		public final Builder casefirst(IcuCollationCaseFirst value) {
+		public final Builder casefirst(@Nullable IcuCollationCaseFirst value) {
 			this.casefirst = value;
 			return this;
 		}
 
 		/**
-		 * Required - API name: {@code caseLevel}
+		 * API name: {@code caseLevel}
 		 */
-		public final Builder caselevel(boolean value) {
+		public final Builder caselevel(@Nullable Boolean value) {
 			this.caselevel = value;
 			return this;
 		}
 
 		/**
-		 * Required - API name: {@code country}
+		 * API name: {@code country}
 		 */
-		public final Builder country(String value) {
+		public final Builder country(@Nullable String value) {
 			this.country = value;
 			return this;
 		}
 
 		/**
-		 * Required - API name: {@code decomposition}
+		 * API name: {@code decomposition}
 		 */
-		public final Builder decomposition(IcuCollationDecomposition value) {
+		public final Builder decomposition(@Nullable IcuCollationDecomposition value) {
 			this.decomposition = value;
 			return this;
 		}
 
 		/**
-		 * Required - API name: {@code hiraganaQuaternaryMode}
+		 * API name: {@code hiraganaQuaternaryMode}
 		 */
-		public final Builder hiraganaquaternarymode(boolean value) {
+		public final Builder hiraganaquaternarymode(@Nullable Boolean value) {
 			this.hiraganaquaternarymode = value;
 			return this;
 		}
 
 		/**
-		 * Required - API name: {@code language}
+		 * API name: {@code language}
 		 */
-		public final Builder language(String value) {
+		public final Builder language(@Nullable String value) {
 			this.language = value;
 			return this;
 		}
 
 		/**
-		 * Required - API name: {@code numeric}
+		 * API name: {@code numeric}
 		 */
-		public final Builder numeric(boolean value) {
+		public final Builder numeric(@Nullable Boolean value) {
 			this.numeric = value;
 			return this;
 		}
 
 		/**
-		 * Required - API name: {@code strength}
+		 * API name: {@code rules}
+		 */
+		public final Builder rules(@Nullable String value) {
+			this.rules = value;
+			return this;
+		}
+
+		/**
+		 * API name: {@code strength}
 		 */
-		public final Builder strength(IcuCollationStrength value) {
+		public final Builder strength(@Nullable IcuCollationStrength value) {
 			this.strength = value;
 			return this;
 		}
@@ -330,9 +407,9 @@ public final Builder variabletop(@Nullable String value) {
 		}
 
 		/**
-		 * Required - API name: {@code variant}
+		 * API name: {@code variant}
 		 */
-		public final Builder variant(String value) {
+		public final Builder variant(@Nullable String value) {
 			this.variant = value;
 			return this;
 		}
@@ -374,6 +451,7 @@ protected static void setupIcuCollationTokenFilterDeserializer(
 		op.add(Builder::hiraganaquaternarymode, JsonpDeserializer.booleanDeserializer(), "hiraganaQuaternaryMode");
 		op.add(Builder::language, JsonpDeserializer.stringDeserializer(), "language");
 		op.add(Builder::numeric, JsonpDeserializer.booleanDeserializer(), "numeric");
+		op.add(Builder::rules, JsonpDeserializer.stringDeserializer(), "rules");
 		op.add(Builder::strength, IcuCollationStrength._DESERIALIZER, "strength");
 		op.add(Builder::variabletop, JsonpDeserializer.stringDeserializer(), "variableTop");
 		op.add(Builder::variant, JsonpDeserializer.stringDeserializer(), "variant");
diff --git a/java-client/src/main/java/co/elastic/clients/elasticsearch/async_search/SubmitRequest.java b/java-client/src/main/java/co/elastic/clients/elasticsearch/async_search/SubmitRequest.java
index c5d7ec817..a41291ffa 100644
--- a/java-client/src/main/java/co/elastic/clients/elasticsearch/async_search/SubmitRequest.java
+++ b/java-client/src/main/java/co/elastic/clients/elasticsearch/async_search/SubmitRequest.java
@@ -43,6 +43,7 @@
 import co.elastic.clients.elasticsearch.core.search.SourceConfig;
 import co.elastic.clients.elasticsearch.core.search.Suggester;
 import co.elastic.clients.elasticsearch.core.search.TrackHits;
+import co.elastic.clients.json.JsonData;
 import co.elastic.clients.json.JsonpDeserializable;
 import co.elastic.clients.json.JsonpDeserializer;
 import co.elastic.clients.json.JsonpMapper;
@@ -117,6 +118,8 @@ public class SubmitRequest extends RequestBase implements JsonpSerializable {
 	@Nullable
 	private final Boolean explain;
 
+	private final Map<String, JsonData> ext;
+
 	private final List<FieldAndFormat> fields;
 
 	@Nullable
@@ -248,6 +251,7 @@ private SubmitRequest(Builder builder) {
 		this.docvalueFields = ApiTypeHelper.unmodifiable(builder.docvalueFields);
 		this.expandWildcards = ApiTypeHelper.unmodifiable(builder.expandWildcards);
 		this.explain = builder.explain;
+		this.ext = ApiTypeHelper.unmodifiable(builder.ext);
 		this.fields = ApiTypeHelper.unmodifiable(builder.fields);
 		this.from = builder.from;
 		this.highlight = builder.highlight;
@@ -438,6 +442,15 @@ public final Boolean explain() {
 		return this.explain;
 	}
 
+	/**
+	 * Configuration of search extensions defined by Elasticsearch plugins.
+	 * <p>
+	 * API name: {@code ext}
+	 */
+	public final Map<String, JsonData> ext() {
+		return this.ext;
+	}
+
 	/**
 	 * Array of wildcard (*) patterns. The request returns values for field names
 	 * matching these patterns in the hits.fields property of the response.
@@ -895,6 +908,17 @@ protected void serializeInternal(JsonGenerator generator, JsonpMapper mapper) {
 			generator.writeKey("explain");
 			generator.write(this.explain);
 
+		}
+		if (ApiTypeHelper.isDefined(this.ext)) {
+			generator.writeKey("ext");
+			generator.writeStartObject();
+			for (Map.Entry<String, JsonData> item0 : this.ext.entrySet()) {
+				generator.writeKey(item0.getKey());
+				item0.getValue().serialize(generator, mapper);
+
+			}
+			generator.writeEnd();
+
 		}
 		if (ApiTypeHelper.isDefined(this.fields)) {
 			generator.writeKey("fields");
@@ -1128,6 +1152,9 @@ public static class Builder extends WithJsonObjectBuilderBase<Builder> implement
 		@Nullable
 		private Boolean explain;
 
+		@Nullable
+		private Map<String, JsonData> ext;
+
 		@Nullable
 		private List<FieldAndFormat> fields;
 
@@ -1476,6 +1503,30 @@ public final Builder explain(@Nullable Boolean value) {
 			return this;
 		}
 
+		/**
+		 * Configuration of search extensions defined by Elasticsearch plugins.
+		 * <p>
+		 * API name: {@code ext}
+		 * <p>
+		 * Adds all entries of <code>map</code> to <code>ext</code>.
+		 */
+		public final Builder ext(Map<String, JsonData> map) {
+			this.ext = _mapPutAll(this.ext, map);
+			return this;
+		}
+
+		/**
+		 * Configuration of search extensions defined by Elasticsearch plugins.
+		 * <p>
+		 * API name: {@code ext}
+		 * <p>
+		 * Adds an entry to <code>ext</code>.
+		 */
+		public final Builder ext(String key, JsonData value) {
+			this.ext = _mapPut(this.ext, key, value);
+			return this;
+		}
+
 		/**
 		 * Array of wildcard (*) patterns. The request returns values for field names
 		 * matching these patterns in the hits.fields property of the response.
@@ -2213,6 +2264,7 @@ protected static void setupSubmitRequestDeserializer(ObjectDeserializer<SubmitRe
 		op.add(Builder::docvalueFields, JsonpDeserializer.arrayDeserializer(FieldAndFormat._DESERIALIZER),
 				"docvalue_fields");
 		op.add(Builder::explain, JsonpDeserializer.booleanDeserializer(), "explain");
+		op.add(Builder::ext, JsonpDeserializer.stringMapDeserializer(JsonData._DESERIALIZER), "ext");
 		op.add(Builder::fields, JsonpDeserializer.arrayDeserializer(FieldAndFormat._DESERIALIZER), "fields");
 		op.add(Builder::from, JsonpDeserializer.integerDeserializer(), "from");
 		op.add(Builder::highlight, Highlight._DESERIALIZER, "highlight");
diff --git a/java-client/src/main/java/co/elastic/clients/elasticsearch/cluster/ComponentTemplateSummary.java b/java-client/src/main/java/co/elastic/clients/elasticsearch/cluster/ComponentTemplateSummary.java
index 4dee0de3b..32dd281a0 100644
--- a/java-client/src/main/java/co/elastic/clients/elasticsearch/cluster/ComponentTemplateSummary.java
+++ b/java-client/src/main/java/co/elastic/clients/elasticsearch/cluster/ComponentTemplateSummary.java
@@ -73,7 +73,7 @@ private ComponentTemplateSummary(Builder builder) {
 
 		this.meta = ApiTypeHelper.unmodifiable(builder.meta);
 		this.version = builder.version;
-		this.settings = ApiTypeHelper.unmodifiableRequired(builder.settings, this, "settings");
+		this.settings = ApiTypeHelper.unmodifiable(builder.settings);
 		this.mappings = builder.mappings;
 		this.aliases = ApiTypeHelper.unmodifiable(builder.aliases);
 
@@ -99,7 +99,7 @@ public final Long version() {
 	}
 
 	/**
-	 * Required - API name: {@code settings}
+	 * API name: {@code settings}
 	 */
 	public final Map<String, IndexSettings> settings() {
 		return this.settings;
@@ -197,6 +197,7 @@ public static class Builder extends WithJsonObjectBuilderBase<Builder>
 		@Nullable
 		private Long version;
 
+		@Nullable
 		private Map<String, IndexSettings> settings;
 
 		@Nullable
@@ -234,7 +235,7 @@ public final Builder version(@Nullable Long value) {
 		}
 
 		/**
-		 * Required - API name: {@code settings}
+		 * API name: {@code settings}
 		 * <p>
 		 * Adds all entries of <code>map</code> to <code>settings</code>.
 		 */
@@ -244,7 +245,7 @@ public final Builder settings(Map<String, IndexSettings> map) {
 		}
 
 		/**
-		 * Required - API name: {@code settings}
+		 * API name: {@code settings}
 		 * <p>
 		 * Adds an entry to <code>settings</code>.
 		 */
@@ -254,7 +255,7 @@ public final Builder settings(String key, IndexSettings value) {
 		}
 
 		/**
-		 * Required - API name: {@code settings}
+		 * API name: {@code settings}
 		 * <p>
 		 * Adds an entry to <code>settings</code> using a builder lambda.
 		 */
diff --git a/java-client/src/main/java/co/elastic/clients/elasticsearch/core/SearchRequest.java b/java-client/src/main/java/co/elastic/clients/elasticsearch/core/SearchRequest.java
index 3baeb921b..a5595f455 100644
--- a/java-client/src/main/java/co/elastic/clients/elasticsearch/core/SearchRequest.java
+++ b/java-client/src/main/java/co/elastic/clients/elasticsearch/core/SearchRequest.java
@@ -43,6 +43,7 @@
 import co.elastic.clients.elasticsearch.core.search.SourceConfig;
 import co.elastic.clients.elasticsearch.core.search.Suggester;
 import co.elastic.clients.elasticsearch.core.search.TrackHits;
+import co.elastic.clients.json.JsonData;
 import co.elastic.clients.json.JsonpDeserializable;
 import co.elastic.clients.json.JsonpDeserializer;
 import co.elastic.clients.json.JsonpMapper;
@@ -117,6 +118,8 @@ public class SearchRequest extends RequestBase implements JsonpSerializable {
 	@Nullable
 	private final Boolean explain;
 
+	private final Map<String, JsonData> ext;
+
 	private final List<FieldAndFormat> fields;
 
 	@Nullable
@@ -241,6 +244,7 @@ private SearchRequest(Builder builder) {
 		this.docvalueFields = ApiTypeHelper.unmodifiable(builder.docvalueFields);
 		this.expandWildcards = ApiTypeHelper.unmodifiable(builder.expandWildcards);
 		this.explain = builder.explain;
+		this.ext = ApiTypeHelper.unmodifiable(builder.ext);
 		this.fields = ApiTypeHelper.unmodifiable(builder.fields);
 		this.from = builder.from;
 		this.highlight = builder.highlight;
@@ -433,6 +437,15 @@ public final Boolean explain() {
 		return this.explain;
 	}
 
+	/**
+	 * Configuration of search extensions defined by Elasticsearch plugins.
+	 * <p>
+	 * API name: {@code ext}
+	 */
+	public final Map<String, JsonData> ext() {
+		return this.ext;
+	}
+
 	/**
 	 * Array of wildcard (*) patterns. The request returns values for field names
 	 * matching these patterns in the hits.fields property of the response.
@@ -881,6 +894,17 @@ protected void serializeInternal(JsonGenerator generator, JsonpMapper mapper) {
 			generator.writeKey("explain");
 			generator.write(this.explain);
 
+		}
+		if (ApiTypeHelper.isDefined(this.ext)) {
+			generator.writeKey("ext");
+			generator.writeStartObject();
+			for (Map.Entry<String, JsonData> item0 : this.ext.entrySet()) {
+				generator.writeKey(item0.getKey());
+				item0.getValue().serialize(generator, mapper);
+
+			}
+			generator.writeEnd();
+
 		}
 		if (ApiTypeHelper.isDefined(this.fields)) {
 			generator.writeKey("fields");
@@ -1114,6 +1138,9 @@ public static class Builder extends WithJsonObjectBuilderBase<Builder> implement
 		@Nullable
 		private Boolean explain;
 
+		@Nullable
+		private Map<String, JsonData> ext;
+
 		@Nullable
 		private List<FieldAndFormat> fields;
 
@@ -1460,6 +1487,30 @@ public final Builder explain(@Nullable Boolean value) {
 			return this;
 		}
 
+		/**
+		 * Configuration of search extensions defined by Elasticsearch plugins.
+		 * <p>
+		 * API name: {@code ext}
+		 * <p>
+		 * Adds all entries of <code>map</code> to <code>ext</code>.
+		 */
+		public final Builder ext(Map<String, JsonData> map) {
+			this.ext = _mapPutAll(this.ext, map);
+			return this;
+		}
+
+		/**
+		 * Configuration of search extensions defined by Elasticsearch plugins.
+		 * <p>
+		 * API name: {@code ext}
+		 * <p>
+		 * Adds an entry to <code>ext</code>.
+		 */
+		public final Builder ext(String key, JsonData value) {
+			this.ext = _mapPut(this.ext, key, value);
+			return this;
+		}
+
 		/**
 		 * Array of wildcard (*) patterns. The request returns values for field names
 		 * matching these patterns in the hits.fields property of the response.
@@ -2188,6 +2239,7 @@ protected static void setupSearchRequestDeserializer(ObjectDeserializer<SearchRe
 		op.add(Builder::docvalueFields, JsonpDeserializer.arrayDeserializer(FieldAndFormat._DESERIALIZER),
 				"docvalue_fields");
 		op.add(Builder::explain, JsonpDeserializer.booleanDeserializer(), "explain");
+		op.add(Builder::ext, JsonpDeserializer.stringMapDeserializer(JsonData._DESERIALIZER), "ext");
 		op.add(Builder::fields, JsonpDeserializer.arrayDeserializer(FieldAndFormat._DESERIALIZER), "fields");
 		op.add(Builder::from, JsonpDeserializer.integerDeserializer(), "from");
 		op.add(Builder::highlight, Highlight._DESERIALIZER, "highlight");
diff --git a/java-client/src/main/java/co/elastic/clients/elasticsearch/core/msearch/MultisearchBody.java b/java-client/src/main/java/co/elastic/clients/elasticsearch/core/msearch/MultisearchBody.java
index 57d70a952..5a09c789f 100644
--- a/java-client/src/main/java/co/elastic/clients/elasticsearch/core/msearch/MultisearchBody.java
+++ b/java-client/src/main/java/co/elastic/clients/elasticsearch/core/msearch/MultisearchBody.java
@@ -36,6 +36,7 @@
 import co.elastic.clients.elasticsearch.core.search.SourceConfig;
 import co.elastic.clients.elasticsearch.core.search.Suggester;
 import co.elastic.clients.elasticsearch.core.search.TrackHits;
+import co.elastic.clients.json.JsonData;
 import co.elastic.clients.json.JsonpDeserializable;
 import co.elastic.clients.json.JsonpDeserializer;
 import co.elastic.clients.json.JsonpMapper;
@@ -79,6 +80,8 @@ public class MultisearchBody implements JsonpSerializable {
 	@Nullable
 	private final Boolean explain;
 
+	private final Map<String, JsonData> ext;
+
 	private final List<String> storedFields;
 
 	private final List<FieldAndFormat> docvalueFields;
@@ -152,6 +155,7 @@ private MultisearchBody(Builder builder) {
 		this.collapse = builder.collapse;
 		this.query = builder.query;
 		this.explain = builder.explain;
+		this.ext = ApiTypeHelper.unmodifiable(builder.ext);
 		this.storedFields = ApiTypeHelper.unmodifiable(builder.storedFields);
 		this.docvalueFields = ApiTypeHelper.unmodifiable(builder.docvalueFields);
 		this.from = builder.from;
@@ -220,6 +224,15 @@ public final Boolean explain() {
 		return this.explain;
 	}
 
+	/**
+	 * Configuration of search extensions defined by Elasticsearch plugins.
+	 * <p>
+	 * API name: {@code ext}
+	 */
+	public final Map<String, JsonData> ext() {
+		return this.ext;
+	}
+
 	/**
 	 * List of stored fields to return as part of a hit. If no fields are specified,
 	 * no stored fields are included in the response. If this field is specified,
@@ -507,6 +520,17 @@ protected void serializeInternal(JsonGenerator generator, JsonpMapper mapper) {
 			generator.writeKey("explain");
 			generator.write(this.explain);
 
+		}
+		if (ApiTypeHelper.isDefined(this.ext)) {
+			generator.writeKey("ext");
+			generator.writeStartObject();
+			for (Map.Entry<String, JsonData> item0 : this.ext.entrySet()) {
+				generator.writeKey(item0.getKey());
+				item0.getValue().serialize(generator, mapper);
+
+			}
+			generator.writeEnd();
+
 		}
 		if (ApiTypeHelper.isDefined(this.storedFields)) {
 			generator.writeKey("stored_fields");
@@ -720,6 +744,9 @@ public static class Builder extends WithJsonObjectBuilderBase<Builder> implement
 		@Nullable
 		private Boolean explain;
 
+		@Nullable
+		private Map<String, JsonData> ext;
+
 		@Nullable
 		private List<String> storedFields;
 
@@ -869,6 +896,30 @@ public final Builder explain(@Nullable Boolean value) {
 			return this;
 		}
 
+		/**
+		 * Configuration of search extensions defined by Elasticsearch plugins.
+		 * <p>
+		 * API name: {@code ext}
+		 * <p>
+		 * Adds all entries of <code>map</code> to <code>ext</code>.
+		 */
+		public final Builder ext(Map<String, JsonData> map) {
+			this.ext = _mapPutAll(this.ext, map);
+			return this;
+		}
+
+		/**
+		 * Configuration of search extensions defined by Elasticsearch plugins.
+		 * <p>
+		 * API name: {@code ext}
+		 * <p>
+		 * Adds an entry to <code>ext</code>.
+		 */
+		public final Builder ext(String key, JsonData value) {
+			this.ext = _mapPut(this.ext, key, value);
+			return this;
+		}
+
 		/**
 		 * List of stored fields to return as part of a hit. If no fields are specified,
 		 * no stored fields are included in the response. If this field is specified,
@@ -1424,6 +1475,7 @@ protected static void setupMultisearchBodyDeserializer(ObjectDeserializer<Multis
 		op.add(Builder::collapse, FieldCollapse._DESERIALIZER, "collapse");
 		op.add(Builder::query, Query._DESERIALIZER, "query");
 		op.add(Builder::explain, JsonpDeserializer.booleanDeserializer(), "explain");
+		op.add(Builder::ext, JsonpDeserializer.stringMapDeserializer(JsonData._DESERIALIZER), "ext");
 		op.add(Builder::storedFields, JsonpDeserializer.arrayDeserializer(JsonpDeserializer.stringDeserializer()),
 				"stored_fields");
 		op.add(Builder::docvalueFields, JsonpDeserializer.arrayDeserializer(FieldAndFormat._DESERIALIZER),
diff --git a/java-client/src/main/java/co/elastic/clients/elasticsearch/doc-files/api-spec.html b/java-client/src/main/java/co/elastic/clients/elasticsearch/doc-files/api-spec.html
index c7bfa89e3..81dafddc3 100644
--- a/java-client/src/main/java/co/elastic/clients/elasticsearch/doc-files/api-spec.html
+++ b/java-client/src/main/java/co/elastic/clients/elasticsearch/doc-files/api-spec.html
@@ -67,13 +67,13 @@
 '_global.mget.Request': '_global/mget/MultiGetRequest.ts#L25-L92',
 '_global.mget.Response': '_global/mget/MultiGetResponse.ts#L22-L26',
 '_global.mget.ResponseItem': '_global/mget/types.ts#L59-L62',
-'_global.msearch.MultiSearchItem': '_global/msearch/types.ts#L202-L205',
-'_global.msearch.MultiSearchResult': '_global/msearch/types.ts#L192-L195',
-'_global.msearch.MultisearchBody': '_global/msearch/types.ts#L69-L190',
-'_global.msearch.MultisearchHeader': '_global/msearch/types.ts#L51-L66',
+'_global.msearch.MultiSearchItem': '_global/msearch/types.ts#L207-L210',
+'_global.msearch.MultiSearchResult': '_global/msearch/types.ts#L197-L200',
+'_global.msearch.MultisearchBody': '_global/msearch/types.ts#L70-L195',
+'_global.msearch.MultisearchHeader': '_global/msearch/types.ts#L52-L67',
 '_global.msearch.Request': '_global/msearch/MultiSearchRequest.ts#L31-L103',
 '_global.msearch.Response': '_global/msearch/MultiSearchResponse.ts#L22-L24',
-'_global.msearch.ResponseItem': '_global/msearch/types.ts#L197-L200',
+'_global.msearch.ResponseItem': '_global/msearch/types.ts#L202-L205',
 '_global.msearch_template.Request': '_global/msearch_template/MultiSearchTemplateRequest.ts#L25-L46',
 '_global.msearch_template.Response': '_global/msearch_template/MultiSearchTemplateResponse.ts#L22-L24',
 '_global.msearch_template.TemplateConfig': '_global/msearch_template/types.ts#L28-L45',
@@ -121,7 +121,7 @@
 '_global.scripts_painless_execute.Response': '_global/scripts_painless_execute/ExecutePainlessScriptResponse.ts#L20-L24',
 '_global.scroll.Request': '_global/scroll/ScrollRequest.ts#L24-L59',
 '_global.scroll.Response': '_global/scroll/ScrollResponse.ts#L22-L24',
-'_global.search.Request': '_global/search/SearchRequest.ts#L51-L236',
+'_global.search.Request': '_global/search/SearchRequest.ts#L51-L240',
 '_global.search.Response': '_global/search/SearchResponse.ts#L34-L36',
 '_global.search.ResponseBody': '_global/search/SearchResponse.ts#L38-L54',
 '_global.search._types.AggregationBreakdown': '_global/search/_types/profile.ts#L22-L35',
@@ -558,19 +558,19 @@
 '_types.analysis.HtmlStripCharFilter': '_types/analysis/char_filters.ts#L43-L45',
 '_types.analysis.HunspellTokenFilter': '_types/analysis/token_filters.ts#L199-L205',
 '_types.analysis.HyphenationDecompounderTokenFilter': '_types/analysis/token_filters.ts#L57-L59',
-'_types.analysis.IcuAnalyzer': '_types/analysis/icu-plugin.ts#L66-L70',
-'_types.analysis.IcuCollationAlternate': '_types/analysis/icu-plugin.ts#L88-L91',
-'_types.analysis.IcuCollationCaseFirst': '_types/analysis/icu-plugin.ts#L93-L96',
-'_types.analysis.IcuCollationDecomposition': '_types/analysis/icu-plugin.ts#L98-L101',
-'_types.analysis.IcuCollationStrength': '_types/analysis/icu-plugin.ts#L103-L109',
-'_types.analysis.IcuCollationTokenFilter': '_types/analysis/icu-plugin.ts#L51-L64',
+'_types.analysis.IcuAnalyzer': '_types/analysis/icu-plugin.ts#L67-L71',
+'_types.analysis.IcuCollationAlternate': '_types/analysis/icu-plugin.ts#L89-L92',
+'_types.analysis.IcuCollationCaseFirst': '_types/analysis/icu-plugin.ts#L94-L97',
+'_types.analysis.IcuCollationDecomposition': '_types/analysis/icu-plugin.ts#L99-L102',
+'_types.analysis.IcuCollationStrength': '_types/analysis/icu-plugin.ts#L104-L110',
+'_types.analysis.IcuCollationTokenFilter': '_types/analysis/icu-plugin.ts#L51-L65',
 '_types.analysis.IcuFoldingTokenFilter': '_types/analysis/icu-plugin.ts#L46-L49',
 '_types.analysis.IcuNormalizationCharFilter': '_types/analysis/icu-plugin.ts#L40-L44',
-'_types.analysis.IcuNormalizationMode': '_types/analysis/icu-plugin.ts#L77-L80',
+'_types.analysis.IcuNormalizationMode': '_types/analysis/icu-plugin.ts#L78-L81',
 '_types.analysis.IcuNormalizationTokenFilter': '_types/analysis/icu-plugin.ts#L35-L38',
-'_types.analysis.IcuNormalizationType': '_types/analysis/icu-plugin.ts#L82-L86',
+'_types.analysis.IcuNormalizationType': '_types/analysis/icu-plugin.ts#L83-L87',
 '_types.analysis.IcuTokenizer': '_types/analysis/icu-plugin.ts#L30-L33',
-'_types.analysis.IcuTransformDirection': '_types/analysis/icu-plugin.ts#L72-L75',
+'_types.analysis.IcuTransformDirection': '_types/analysis/icu-plugin.ts#L73-L76',
 '_types.analysis.IcuTransformTokenFilter': '_types/analysis/icu-plugin.ts#L24-L28',
 '_types.analysis.KStemTokenFilter': '_types/analysis/token_filters.ts#L238-L240',
 '_types.analysis.KeepTypesMode': '_types/analysis/token_filters.ts#L212-L215',
@@ -835,7 +835,7 @@
 'async_search.get.Response': 'async_search/get/AsyncSearchGetResponse.ts#L22-L24',
 'async_search.status.Request': 'async_search/status/AsyncSearchStatusRequest.ts#L23-L32',
 'async_search.status.Response': 'async_search/status/AsyncSearchStatusResponse.ts#L24-L29',
-'async_search.submit.Request': 'async_search/submit/AsyncSearchSubmitRequest.ts#L53-L243',
+'async_search.submit.Request': 'async_search/submit/AsyncSearchSubmitRequest.ts#L53-L247',
 'async_search.submit.Response': 'async_search/submit/AsyncSearchSubmitResponse.ts#L22-L24',
 'autoscaling._types.AutoscalingPolicy': 'autoscaling/_types/AutoscalingPolicy.ts#L23-L27',
 'autoscaling.delete_autoscaling_policy.Request': 'autoscaling/delete_autoscaling_policy/DeleteAutoscalingPolicyRequest.ts#L23-L32',
@@ -2323,10 +2323,10 @@
         if (hash.length > 1) {
             hash = hash.substring(1);
         }
-        window.location = "https://github.com/elastic/elasticsearch-specification/tree/984c21945c71f1a658355803d43a7add2dac7265/specification/" + (paths[hash] || "");
+        window.location = "https://github.com/elastic/elasticsearch-specification/tree/85133bd6101deda7a4ec9b29714e979c11a547c0/specification/" + (paths[hash] || "");
     </script>
 </head>
 <body>
-    Please see the <a href="https://github.com/elastic/elasticsearch-specification/tree/984c21945c71f1a658355803d43a7add2dac7265/specification/">Elasticsearch API specification</a>.
+    Please see the <a href="https://github.com/elastic/elasticsearch-specification/tree/85133bd6101deda7a4ec9b29714e979c11a547c0/specification/">Elasticsearch API specification</a>.
 </body>
 </html>
diff --git a/java-client/src/main/java/co/elastic/clients/elasticsearch/indices/IndexVersioning.java b/java-client/src/main/java/co/elastic/clients/elasticsearch/indices/IndexVersioning.java
index fed1e8013..f8553b6ba 100644
--- a/java-client/src/main/java/co/elastic/clients/elasticsearch/indices/IndexVersioning.java
+++ b/java-client/src/main/java/co/elastic/clients/elasticsearch/indices/IndexVersioning.java
@@ -30,7 +30,6 @@
 import co.elastic.clients.json.JsonpUtils;
 import co.elastic.clients.json.ObjectBuilderDeserializer;
 import co.elastic.clients.json.ObjectDeserializer;
-import co.elastic.clients.util.ApiTypeHelper;
 import co.elastic.clients.util.ObjectBuilder;
 import co.elastic.clients.util.WithJsonObjectBuilderBase;
 import jakarta.json.stream.JsonGenerator;
@@ -48,13 +47,14 @@
  */
 @JsonpDeserializable
 public class IndexVersioning implements JsonpSerializable {
+	@Nullable
 	private final String created;
 
 	// ---------------------------------------------------------------------------------------------
 
 	private IndexVersioning(Builder builder) {
 
-		this.created = ApiTypeHelper.requireNonNull(builder.created, this, "created");
+		this.created = builder.created;
 
 	}
 
@@ -63,8 +63,9 @@ public static IndexVersioning of(Function<Builder, ObjectBuilder<IndexVersioning
 	}
 
 	/**
-	 * Required - API name: {@code created}
+	 * API name: {@code created}
 	 */
+	@Nullable
 	public final String created() {
 		return this.created;
 	}
@@ -80,8 +81,11 @@ public void serialize(JsonGenerator generator, JsonpMapper mapper) {
 
 	protected void serializeInternal(JsonGenerator generator, JsonpMapper mapper) {
 
-		generator.writeKey("created");
-		generator.write(this.created);
+		if (this.created != null) {
+			generator.writeKey("created");
+			generator.write(this.created);
+
+		}
 
 	}
 
@@ -97,12 +101,13 @@ public String toString() {
 	 */
 
 	public static class Builder extends WithJsonObjectBuilderBase<Builder> implements ObjectBuilder<IndexVersioning> {
+		@Nullable
 		private String created;
 
 		/**
-		 * Required - API name: {@code created}
+		 * API name: {@code created}
 		 */
-		public final Builder created(String value) {
+		public final Builder created(@Nullable String value) {
 			this.created = value;
 			return this;
 		}
diff --git a/java-client/src/main/java/co/elastic/clients/elasticsearch/security/GetTokenResponse.java b/java-client/src/main/java/co/elastic/clients/elasticsearch/security/GetTokenResponse.java
index 2cae77849..a7a268eff 100644
--- a/java-client/src/main/java/co/elastic/clients/elasticsearch/security/GetTokenResponse.java
+++ b/java-client/src/main/java/co/elastic/clients/elasticsearch/security/GetTokenResponse.java
@@ -59,6 +59,7 @@ public class GetTokenResponse implements JsonpSerializable {
 
 	private final String type;
 
+	@Nullable
 	private final String refreshToken;
 
 	@Nullable
@@ -74,7 +75,7 @@ private GetTokenResponse(Builder builder) {
 		this.expiresIn = ApiTypeHelper.requireNonNull(builder.expiresIn, this, "expiresIn");
 		this.scope = builder.scope;
 		this.type = ApiTypeHelper.requireNonNull(builder.type, this, "type");
-		this.refreshToken = ApiTypeHelper.requireNonNull(builder.refreshToken, this, "refreshToken");
+		this.refreshToken = builder.refreshToken;
 		this.kerberosAuthenticationResponseToken = builder.kerberosAuthenticationResponseToken;
 		this.authentication = ApiTypeHelper.requireNonNull(builder.authentication, this, "authentication");
 
@@ -114,8 +115,9 @@ public final String type() {
 	}
 
 	/**
-	 * Required - API name: {@code refresh_token}
+	 * API name: {@code refresh_token}
 	 */
+	@Nullable
 	public final String refreshToken() {
 		return this.refreshToken;
 	}
@@ -160,9 +162,11 @@ protected void serializeInternal(JsonGenerator generator, JsonpMapper mapper) {
 		generator.writeKey("type");
 		generator.write(this.type);
 
-		generator.writeKey("refresh_token");
-		generator.write(this.refreshToken);
+		if (this.refreshToken != null) {
+			generator.writeKey("refresh_token");
+			generator.write(this.refreshToken);
 
+		}
 		if (this.kerberosAuthenticationResponseToken != null) {
 			generator.writeKey("kerberos_authentication_response_token");
 			generator.write(this.kerberosAuthenticationResponseToken);
@@ -194,6 +198,7 @@ public static class Builder extends WithJsonObjectBuilderBase<Builder> implement
 
 		private String type;
 
+		@Nullable
 		private String refreshToken;
 
 		@Nullable
@@ -234,9 +239,9 @@ public final Builder type(String value) {
 		}
 
 		/**
-		 * Required - API name: {@code refresh_token}
+		 * API name: {@code refresh_token}
 		 */
-		public final Builder refreshToken(String value) {
+		public final Builder refreshToken(@Nullable String value) {
 			this.refreshToken = value;
 			return this;
 		}