rahulgoswami commented on PR #15431:
URL: https://github.com/apache/lucene/pull/15431#issuecomment-3546082022

   gradlew check passes fine, but the nightly tests in 
TestBinaryBackwardsCompatibility are failing. Specifically 
TestBinaryBackwardsCompatibility.testReadNMinusTwoCommit and 
TestBinaryBackwardsCompatibility.testReadNMinusTwoSegmentInfos. 
   
   These try to test opening N-2 version (=8.x) and expect success. This used 
to work earlier with VERSION_74 in checkHeaderNoMagic(), but fails now (for 
version < 8.6.0) since we moved to VERSION_86. Staying with VERSION_74 
complains about missing Lucene_70 codec (same as main). "main" doesn't have 
this problem because N-2=9.x 
   
   I have not yet understood _**why**_ test for N-2 when we anyway don't 
support the index.
   
   To reproduce:
   ./gradlew test --tests 
TestBinaryBackwardsCompatibility.testReadNMinusTwoSegmentInfos 
-Dtests.seed=738894B1606DB252 -Dtests.nightly=true -Dtests.locale=en-IM 
-Dtests.timezone=Australia/Queensland -Dtests.asserts=true 
-Dtests.file.encoding=UTF-8


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