Github user tzulitai commented on the issue:
https://github.com/apache/flink/pull/6043
I took another look at the PR, and also talked with @tillrohrmann about
merging this for 1.6.
I think this LGTM, and with these changes we will at least have an ES 5.x
connector that is 5.3+ compatible.
Merging ..
After merging this, I'll also try cherry-picking your 6.x REST-based ES
connector on top. If that works well, will also merge that.---
