Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/5124
I think the intent here is good, but every time some class is annotated
with `@Public`, that is a commitment to keep the API stable.
Before doing that, the community members that mainly authored or maintain
that code should chime in and agree on which classes should actually be
`@Public` and which ones `@PublicEvolving`.---
