iverase commented on PR #15732:
URL: https://github.com/apache/lucene/pull/15732#issuecomment-4040377080

   @msokolov After some thought, doing the way you suggested requires a change 
on the semantics of `PerFieldKnnVectorsFormat` as it requires the method 
`getKnnVectorsFormatForField` to be idempotent which it is currently not 
required. 
   
   This is a big change as it is possible now to change the format of the new 
segments in an existing index. This will not be possible if we add two methods 
for merging. 


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