spinscale opened a new issue, #15716:
URL: https://github.com/apache/lucene/issues/15716

   ### Description
   
   This test fails reproducibly with the specified seed. My assumption here is, 
that due to using a `RandomIndexWriter`, the `addDocument()` method in there 
calls `LuceneTestCase.maybeChangeLiveIndexWriterConfig()` - which might change 
the CFS parameters and thus the test ends up with two different configuration 
settings for the two directories specified. I don't see how that can be changed 
via configuration, so I'd go for a regular `IndexWriter` instead. Will open a 
PR for that.
   
   ### Gradle command to reproduce
   
   ```
   ./gradlew :lucene:core:test --tests 
"org.apache.lucene.index.TestSwappedIndexFiles.test" 
-Ptests.seed=397C971E9E35FD4E -Ptests.verbose=true
   ```


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