Adrien Grand created LUCENE-7756:
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             Summary: Only record the major that was used to create the index 
rather than the full version
                 Key: LUCENE-7756
                 URL: https://issues.apache.org/jira/browse/LUCENE-7756
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Adrien Grand
            Priority: Minor


LUCENE-7703 added information about the Lucene version that was used to create 
the index to the segment infos. But since there is a single creation version, 
it means we need to reject calls to addIndexes that can mix indices that have 
different creation versions, which might be seen as an important regression by 
some users. So I have been thinking about only recording the major version that 
was used to create the index, which is still very valuable information and 
would allow us to accept calls to addIndexes when all merged indices have the 
same major version. This looks like a better trade-off to me.



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