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Released: <Flink Version>

POC: https://github.com/AHeise/flink/tree/custom_sink_sketch

Please keep the discussion on the mailing list rather than commenting on the wiki (wiki discussions get unwieldy fast).

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Since the DataStream class is not part of the flink-core module all advanced Sink interfaces are part of the flink-streaming-java. We mitigate the problem by adding enough documentation i.e. in the doc strings that users are aware of the split.

Compatibility, Deprecation, and Migration Plan

As part of this FLIP, we will migrate all sinks that are currently part of the Flink main repository to the Sink V2 interfaces (i.e. Async, Kafka, Elasticsearch, File). We will not break the existing Sink V1 interfaces because they are already used within the community but we will make them @PublicEvolving  and immediately deprecate them. Our plan is that we keep the Sink V1 interfaces at least until the next major version (2.0) of Flink.

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