Github user tzulitai commented on the issue:
https://github.com/apache/flink/pull/3934
Answer to some of your other questions:
1. I don't think the Apache ICLA is strictly required, unless you're
invited as a Committer of the project.
2. The tests should be added under `src/test/...` directory of the module.
I think the already-existing IT tests for the ES sinks already cover the
changed functionality here. Since this isn't a very complicated feature, for
new tests, at the very most I would suggest perhaps to add unit tests that test
the factory is correctly respected during the init flow.
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