Github user mattyb149 commented on the issue:
https://github.com/apache/nifi/pull/576
Per an offline discussion with @JPercivall, Multi-Get and/or Search
capabilities are not really right for the FetchXYZ processor idiom. A better
solution may be a List/Search/Execute processor for Elasticsearch that works in
the same vein as the existing ListXYZ processors, to maintain the List->Fetch
pattern.
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