Stefan Richter commented on FLINK-8837:

I think there is one problem with keeping it in an experimental package: this 
class is used to expose functionality that goes through package-private methods 
in data stream classes. If we move it to a different package, those methods 
need to become public. If the methods are public, then there is also little use 
in exposing them over `DataStreamUtils`.

> Move DataStreamUtils to package 'experimental'.
> -----------------------------------------------
>                 Key: FLINK-8837
>                 URL: https://issues.apache.org/jira/browse/FLINK-8837
>             Project: Flink
>          Issue Type: Bug
>          Components: Streaming
>            Reporter: Stephan Ewen
>            Priority: Blocker
>             Fix For: 1.5.0
> The class {{DataStreamUtils}} came from 'flink-contrib' and now accidentally 
> moved to the fully supported API packages. It should be in package 
> 'experimental' to properly communicate that it is not guaranteed to be API 
> stable.

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