Jackie-Jiang commented on PR #11857:
URL: https://github.com/apache/pinot/pull/11857#issuecomment-1786334368

   - What will happen to the segments with existing lucene index?
   - Do we need to regenerate lucene index on-the-fly for all the segments on 
the server during segment load?
   - How costly it is to regenerate the index?
   - Are we able to clean up the old lucene index?
   
   IMO the much safer solution would be to introduce a new version to achieve 
the migration, similar to how raw index is upgraded.


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