benwtrent commented on PR #16034:
URL: https://github.com/apache/lucene/pull/16034#issuecomment-4421838526

   @aruggero wow, thank you a bunch for all the benchmarks and work!
   
   man, it is frustrating how this doesn't give us ANYTHING out of the box :( I 
suppose it makes sense. The benefit of HNSW is that its a very sparse graph 
with big jumps, so multiplying ops per connection are nasty. I was sort of 
holding out hope that we would get a cheeky perf bump :( Especially since bulk 
scoring is usually much faster (since vectors are also near each other in 
memory) and paragraphs/sub-vectors should be near one another in space already. 
   
   While I am not sure this is something we should provide OOTB for all diverse 
children queries, it does seem neat to be able to provide "give me parent docs 
based on the FURTHEST child", this forces even the most irrelevant child to be 
considered. 


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