romseygeek commented on PR #12169:
URL: https://github.com/apache/lucene/pull/12169#issuecomment-1520230067

   Ah, welcome to the world of randomized tests :)  We have automated tests in 
lucene that use randomized parameters to generate some of their test 
configurations, as a way of increasing coverage.  This particular one will 
generate an analysis chain from a random set of token filters and check that it 
produces tokens that conform to certain behaviours.  This one was picked up by 
the elasticsearch CI system, but we have ones running on apache hardware as 
well.  The randomization is controlled by a seed (which is why the failure only 
reproduces with the specific command line I reproduced above).  Lots and lots 
of details can be found in the `help/tests.txt` file file.


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