Ah ok, the idea is that the unversioned URLs point to the oldest supported REST 
API version, right? The problem with this approach is that we would break the 
API (unversioned URLs) every time we drop support for a given version. Given 
that the versioned URLs are stable and we did not promise REST API stability 
yet, this should most likely be ok. 

The breaking change would only happen if users of the unversioned URLs don't 
migrate to the versioned URLs and we drop support for a version. Once we do 
this, we should add it to the migration guide.

Could we maybe add a check which only registers handlers of the oldest version 
under the unversioned URLs instead of all?

[ Full content available at: https://github.com/apache/flink/pull/6602 ]
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