easyice commented on PR #12782:
URL: https://github.com/apache/lucene/pull/12782#issuecomment-1958968291

   > @easyice Hi, I have doubt that the encoding data result using group-varint 
encoding is different from the old way, so is this way compatible with the old 
index format data?
   
   This change was released at lucene 9.9.0,  which uses a new version of 
posting format `Lucene99PostingsFormat`, if you read a old index format, it 
will use the matching posting format class to decode the index. so it will 
compatible with the old index.
   
   Have you got specific errors? could you give some detailed message? Thanks!
   
   See 
https://lucene.apache.org/core/9_9_0/changes/Changes.html#v9.9.0.optimizations


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