Github user tillrohrmann commented on the issue:
https://github.com/apache/flink/pull/4906
Sorry for joining the party late, but I don't think that it is a good idea
to duplicate code by copying code from one module into the other, as happened
for the `FutureUtils` for example. The proper solution would be to move the
`FutureUtils` into `flink-core` such that they are accessible from all places.
Doing differently will lead us to maintenance hell quite quickly.---
