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Posted to issues@lucene.apache.org by GitBox <gi...@apache.org> on 2021/07/28 12:59:22 UTC

[GitHub] [lucene] jpountz commented on pull request #220: LUCENE-9450: Use BinaryDocValue fields in the taxonomy index based on the existing index version

jpountz commented on pull request #220:
URL: https://github.com/apache/lucene/pull/220#issuecomment-888288068


   > What is the use of the LiveIndexWriterConfig.createdVersionMajor
   
   It's very expert. It's necessary if you have multiple workers creating indices that you then want to merge together using `IndexWriter#addIndexes`. `addIndexes` requires that all indices have the same major version, so if you are doing a rolling upgrade on your workers to a new Lucene major, this helps ensure that all indices are created in a way that they can be merged eventually.


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