rmuir commented on issue #13805:
URL: https://github.com/apache/lucene/issues/13805#issuecomment-2360728834

   sounds like the safe bet to backout any changes messing around with 
fieldinfos on merge.
   
   Sorry for the short explanation, there is a long history of super-sneaky 
corruption bugs like this. always happening on some corner-case such as 
`addIndexes(reader)` or across different versions, or something like that. When 
they happen on merge it makes debugging them especially difficult. Mixing up 
data across fields because of field numbers happened more than once.
   
   This is why, if you look at bulk merge code, you see crazy sysprop escape 
hatches and stuffl like that: 
https://github.com/apache/lucene/blob/main/lucene/core/src/java/org/apache/lucene/codecs/lucene90/compressing/Lucene90CompressingStoredFieldsWriter.java#L492-L508


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