morhidi commented on PR #496:
URL: 
https://github.com/apache/flink-kubernetes-operator/pull/496#issuecomment-1368287853

   > Maybe I just don’t understand what your concrete suggestion is :)
   
   Just append this to the validation error you already added: `they first have 
to restart the job with the old version then perform the upgrade from that 
state or use a savepoint.` Otherwise the users wont know what to do.


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