jtibshirani opened a new pull request #432:
URL: https://github.com/apache/lucene/pull/432


   Before when creating a KnnVectorsWriter for merging, we consulted the 
existing
   "PER_FIELD_SUFFIX_KEY" attribute to determine the format's per-field suffix.
   This isn't correct since we could be using a new codec (that produces 
different
   formats/ suffixes).
   
   This commit modifies TestPerFieldDocValuesFormat#testMergeUsesNewFormat to
   trigger the problem. Without the fix we it throws an error like
   "java.nio.file.FileAlreadyExistsException: File
   "_3_Lucene90HnswVectorsFormat_0.vem" was already written to."


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