Github user zentol commented on the issue:
https://github.com/apache/flink/pull/3117
@ShashwatRastogi-Reflektion
1. For each task to load from the savepoint S1:
* Determine the existing hash by searching for the task ID in the logs/UI
* Set the uidHash for that task to that value via
`SingleOutputStreamOperator#setUidHash`
2. For each task:
* Set the uid to whatever value you wish in the future to use via
`SingleOutputStreamOperator#setUid`
3. Resume the job from the savepoint S1.
4. Create a new savepoint S2, and remove all calls to `setUidHash`
5. Resume the job from the savepoint S2.
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