javanna opened a new pull request, #12369:
URL: https://github.com/apache/lucene/pull/12369

   We have recently increased the likelihood of leveraging inter-segment search 
concurrency in tests when newSearcher is used to create the index searcher (see 
#959). When parallel execution is enabled though, an executor is only set 50% 
of the times, and parallel execution is dependent on the number of documents 
and segments indexed. That means that out of 1000 test runs that uses 
RandomIndexWriter to index a random number of docs up to 1000, we will 
effectively parallelize only a couple of times.
   
   This commit increases the likelihood of running concurrent searches by 
lowering further the slice thresholds and setting the executor frequently 
instead of 50% of the times.


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