mikemccand commented on PR #15978:
URL: https://github.com/apache/lucene/pull/15978#issuecomment-4315000098

   Whoa, thank you for the quick PR @iprithv!  I'll have a look soon.  This 
would make segment traces more consumable, and then we can also more accurately 
measure effective HNSW concurrency for each merge.
   
   The  reason I'm chasing this is I was worried about a possible concurrency 
bug where a merge would incorrectly remain single-threaded for its duration if 
when the merge started there were other merges temporarily consuming all HNSW 
worker threads.  Not sure there really is a bug ... speculating by attempting 
to simulate code in my head ;) 


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