mikemccand commented on issue #15516:
URL: https://github.com/apache/lucene/issues/15516#issuecomment-3687003406

   Thanks @rohit211-s -- I don't think we (Amazon customer facing product 
search team) need an issue for this? (nothing really to fix) -- it was more of 
an interesting observation to share with the Lucene dev community what impact 
upgrading Lucene 10.2.x -> 10.3.2 had, specifically the change in HNSW graph 
encoding from `vInt` -> `groupVInt` (we suspect but not 100% certain!).
   
   That change increased the size on disk of just the HNSW graph by ~10% for 
us, which was a bit surprising (I think offline `luceneutil` benchmarks didn't 
show that at the time?).
   
   Note that the HNSW graphs are a tiny part of the overall index so it's not 
really a problem...


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