Github user fpompermaier commented on the issue:
https://github.com/apache/flink/pull/2790
From my point of view ElasticSearchHelper is very useful if you plan to use
the Flink Elasticsearch Sink in a real production use case, because it reduce a
lot the complexity of interfacing with ES.
We didn't use ES java client before and it took about 2 days to write that
helper...I think it's not that obvious to rewrite that logic from the scratch.
Ina production environment you really needs to easy customize indexing
templates and mappings IMHO
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