benwtrent opened a new pull request, #12452:
URL: https://github.com/apache/lucene/pull/12452

   When running 
`HnswGraphTestCase#testSortedAndUnsortedIndicesReturnSameResults`, we search 
two separate graph structures. These structures can change depending on the 
order of the vectors seen and consequently a different result set could be 
returned from the same query. 
   
   To account for this, the test had a higher number of exploration candidates 
(ef_search/k) of `50`, but in one particular seed: `C8AAF5E4648B4226`, it 
failed.
   
   I have verified that bumping the search candidate pool to 60 fixes the 
failure. 
   
   The total number of vectors still out numbers the requested number of 
candidates, so the search is still hitting the graph.
   
   I verified further by running the test again over a couple thousand seeds 
and it didn't fail again.
   


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