Add pipeline aggregations to NativeSearchQuery.

src/main/java/org/springframework/data/elasticsearch/core/RequestFactory.java

@@ -77,7 +77,6 @@
 import org.elasticsearch.index.reindex.UpdateByQueryRequest;
 import org.elasticsearch.index.reindex.UpdateByQueryRequestBuilder;
 import org.elasticsearch.script.Script;
-import org.elasticsearch.search.aggregations.AbstractAggregationBuilder;
 import org.elasticsearch.search.builder.SearchSourceBuilder;
 import org.elasticsearch.search.fetch.subphase.FetchSourceContext;
 import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
@@ -1119,9 +1118,11 @@ private void prepareNativeSearch(NativeSearchQuery query, SearchSourceBuilder so
 		}
 
 		if (!isEmpty(query.getAggregations())) {
-			for (AbstractAggregationBuilder<?> aggregationBuilder : query.getAggregations()) {
-				sourceBuilder.aggregation(aggregationBuilder);
-			}
+			query.getAggregations().forEach(sourceBuilder::aggregation);
+		}
+
+		if (!isEmpty(query.getPipelineAggregations())) {
+			query.getPipelineAggregations().forEach(sourceBuilder::aggregation);
 		}
 
 	}
@@ -1144,9 +1145,11 @@ private void prepareNativeSearch(SearchRequestBuilder searchRequestBuilder, Nati
 		}
 
 		if (!isEmpty(nativeSearchQuery.getAggregations())) {
-			for (AbstractAggregationBuilder<?> aggregationBuilder : nativeSearchQuery.getAggregations()) {
-				searchRequestBuilder.addAggregation(aggregationBuilder);
-			}
+			nativeSearchQuery.getAggregations().forEach(searchRequestBuilder::addAggregation);
+		}
+
+		if (!isEmpty(nativeSearchQuery.getPipelineAggregations())) {
+			nativeSearchQuery.getPipelineAggregations().forEach(searchRequestBuilder::addAggregation);
 		}
 	}
 

src/main/java/org/springframework/data/elasticsearch/core/query/NativeSearchQuery.java

@@ -22,6 +22,7 @@
 import org.elasticsearch.index.query.QueryBuilder;
 import org.elasticsearch.script.mustache.SearchTemplateRequestBuilder;
 import org.elasticsearch.search.aggregations.AbstractAggregationBuilder;
+import org.elasticsearch.search.aggregations.PipelineAggregationBuilder;
 import org.elasticsearch.search.collapse.CollapseBuilder;
 import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
 import org.elasticsearch.search.sort.SortBuilder;
@@ -48,6 +49,7 @@ public class NativeSearchQuery extends AbstractQuery {
 	private final List<ScriptField> scriptFields = new ArrayList<>();
 	@Nullable private CollapseBuilder collapseBuilder;
 	@Nullable private List<AbstractAggregationBuilder<?>> aggregations;
+	@Nullable private List<PipelineAggregationBuilder> pipelineAggregations;
 	@Nullable private HighlightBuilder highlightBuilder;
 	@Nullable private HighlightBuilder.Field[] highlightFields;
 	@Nullable private List<IndexBoost> indicesBoost;
@@ -143,6 +145,11 @@ public List<AbstractAggregationBuilder<?>> getAggregations() {
 		return aggregations;
 	}
 
+	@Nullable
+	public List<PipelineAggregationBuilder> getPipelineAggregations() {
+		return pipelineAggregations;
+	}
+
 	public void addAggregation(AbstractAggregationBuilder<?> aggregationBuilder) {
 
 		if (aggregations == null) {
@@ -156,6 +163,10 @@ public void setAggregations(List<AbstractAggregationBuilder<?>> aggregations) {
 		this.aggregations = aggregations;
 	}
 
+	public void setPipelineAggregations(List<PipelineAggregationBuilder> pipelineAggregationBuilders) {
+		this.pipelineAggregations = pipelineAggregationBuilders;
+	}
+
 	@Nullable
 	public List<IndexBoost> getIndicesBoost() {
 		return indicesBoost;

src/main/java/org/springframework/data/elasticsearch/core/query/NativeSearchQueryBuilder.java

@@ -27,6 +27,7 @@
 import org.elasticsearch.index.query.QueryBuilder;
 import org.elasticsearch.script.mustache.SearchTemplateRequestBuilder;
 import org.elasticsearch.search.aggregations.AbstractAggregationBuilder;
+import org.elasticsearch.search.aggregations.PipelineAggregationBuilder;
 import org.elasticsearch.search.collapse.CollapseBuilder;
 import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
 import org.elasticsearch.search.sort.SortBuilder;
@@ -55,6 +56,7 @@ public class NativeSearchQueryBuilder {
 	private final List<ScriptField> scriptFields = new ArrayList<>();
 	private final List<SortBuilder<?>> sortBuilders = new ArrayList<>();
 	private final List<AbstractAggregationBuilder<?>> aggregationBuilders = new ArrayList<>();
+	private final List<PipelineAggregationBuilder> pipelineAggregationBuilders = new ArrayList<>();
 	@Nullable private HighlightBuilder highlightBuilder;
 	@Nullable private HighlightBuilder.Field[] highlightFields;
 	private Pageable pageable = Pageable.unpaged();
@@ -105,6 +107,14 @@ public NativeSearchQueryBuilder addAggregation(AbstractAggregationBuilder<?> agg
 		return this;
 	}
 
+	/**
+	 * @since 4.3
+	 */
+	public NativeSearchQueryBuilder addAggregation(PipelineAggregationBuilder pipelineAggregationBuilder) {
+		this.pipelineAggregationBuilders.add(pipelineAggregationBuilder);
+		return this;
+	}
+
 	public NativeSearchQueryBuilder withHighlightBuilder(HighlightBuilder highlightBuilder) {
 		this.highlightBuilder = highlightBuilder;
 		return this;
@@ -239,6 +249,10 @@ public NativeSearchQuery build() {
 			nativeSearchQuery.setAggregations(aggregationBuilders);
 		}
 
+		if (!isEmpty(pipelineAggregationBuilders)) {
+			nativeSearchQuery.setPipelineAggregations(pipelineAggregationBuilders);
+		}
+
 		if (minScore > 0) {
 			nativeSearchQuery.setMinScore(minScore);
 		}

src/test/java/org/springframework/data/elasticsearch/core/aggregation/ElasticsearchTemplateAggregationTests.java

@@ -18,6 +18,7 @@
 import static org.assertj.core.api.Assertions.*;
 import static org.elasticsearch.index.query.QueryBuilders.*;
 import static org.elasticsearch.search.aggregations.AggregationBuilders.*;
+import static org.elasticsearch.search.aggregations.PipelineAggregatorBuilders.*;
 import static org.springframework.data.elasticsearch.annotations.FieldType.*;
 import static org.springframework.data.elasticsearch.annotations.FieldType.Integer;
 
@@ -26,9 +27,14 @@
 import java.util.List;
 
 import org.elasticsearch.action.search.SearchType;
+import org.elasticsearch.search.aggregations.Aggregation;
 import org.elasticsearch.search.aggregations.Aggregations;
+import org.elasticsearch.search.aggregations.pipeline.InternalStatsBucket;
+import org.elasticsearch.search.aggregations.pipeline.ParsedStatsBucket;
+import org.elasticsearch.search.aggregations.pipeline.StatsBucket;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.annotation.Configuration;
@@ -109,7 +115,7 @@ public void after() {
 		indexOperations.delete();
 	}
 
-	@Test
+	@Test // DATAES-96
 	public void shouldReturnAggregatedResponseForGivenSearchQuery() {
 
 		// given
@@ -130,6 +136,56 @@ public void shouldReturnAggregatedResponseForGivenSearchQuery() {
 		assertThat(searchHits.hasSearchHits()).isFalse();
 	}
 
+	@Test // #1255
+	@DisplayName("should work with pipeline aggregations")
+	void shouldWorkWithPipelineAggregations() {
+
+		IndexInitializer.init(operations.indexOps(PipelineAggsEntity.class));
+		operations.save( //
+				new PipelineAggsEntity("1-1", "one"), //
+				new PipelineAggsEntity("2-1", "two"), //
+				new PipelineAggsEntity("2-2", "two"), //
+				new PipelineAggsEntity("3-1", "three"), //
+				new PipelineAggsEntity("3-2", "three"), //
+				new PipelineAggsEntity("3-3", "three") //
+		); //
+
+		NativeSearchQuery searchQuery = new NativeSearchQueryBuilder() //
+				.withQuery(matchAllQuery()) //
+				.withSearchType(SearchType.DEFAULT) //
+				.addAggregation(terms("keyword_aggs").field("keyword")) //
+				.addAggregation(statsBucket("keyword_bucket_stats", "keyword_aggs._count")) //
+				.withMaxResults(0) //
+				.build();
+
+		SearchHits<PipelineAggsEntity> searchHits = operations.search(searchQuery, PipelineAggsEntity.class);
+
+		Aggregations aggregations = searchHits.getAggregations();
+		assertThat(aggregations).isNotNull();
+		assertThat(aggregations.asMap().get("keyword_aggs")).isNotNull();
+		Aggregation keyword_bucket_stats = aggregations.asMap().get("keyword_bucket_stats");
+		assertThat(keyword_bucket_stats).isInstanceOf(StatsBucket.class);
+		if (keyword_bucket_stats instanceof ParsedStatsBucket) {
+			// Rest client
+			ParsedStatsBucket statsBucket = (ParsedStatsBucket) keyword_bucket_stats;
+			assertThat(statsBucket.getMin()).isEqualTo(1.0);
+			assertThat(statsBucket.getMax()).isEqualTo(3.0);
+			assertThat(statsBucket.getAvg()).isEqualTo(2.0);
+			assertThat(statsBucket.getSum()).isEqualTo(6.0);
+			assertThat(statsBucket.getCount()).isEqualTo(3L);
+		}
+		if (keyword_bucket_stats instanceof InternalStatsBucket) {
+			// transport client
+			InternalStatsBucket statsBucket = (InternalStatsBucket) keyword_bucket_stats;
+			assertThat(statsBucket.getMin()).isEqualTo(1.0);
+			assertThat(statsBucket.getMax()).isEqualTo(3.0);
+			assertThat(statsBucket.getAvg()).isEqualTo(2.0);
+			assertThat(statsBucket.getSum()).isEqualTo(6.0);
+			assertThat(statsBucket.getCount()).isEqualTo(3L);
+		}
+	}
+
+	// region entities
 	@Document(indexName = "test-index-articles-core-aggregation")
 	static class ArticleEntity {
 
@@ -256,4 +312,34 @@ public IndexQuery buildIndex() {
 		}
 	}
 
+	@Document(indexName = "pipeline-aggs")
+	static class PipelineAggsEntity {
+		@Id private String id;
+		@Field(type = Keyword) private String keyword;
+
+		public PipelineAggsEntity() {}
+
+		public PipelineAggsEntity(String id, String keyword) {
+			this.id = id;
+			this.keyword = keyword;
+		}
+
+		public String getId() {
+			return id;
+		}
+
+		public void setId(String id) {
+			this.id = id;
+		}
+
+		public String getKeyword() {
+			return keyword;
+		}
+
+		public void setKeyword(String keyword) {
+			this.keyword = keyword;
+		}
+	}
+	// endregion
+
 }