Add new Elasticsearch client as an alternative to the existing REST c… #2160
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This PR (almost) finishes integration of the new Elasticsearch client - although there are still some missing features and open issues which are addressed by separate issues.
Partly this is due to functionality missing from the new Elasticsearch client (#2139, #2150), or there was no time to finish this up before the 4.4 release (#2154, #2155, #2156).
I think it is important to have this state in the 4.4.0 release so that the integration of the new Elasticsearch can already be tested by users.
The missing features and updates from the Elasticsearch client will be implemented in both the main and 4.4.x branches as soon as possible.
Closes #1973