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https://issues.apache.org/jira/browse/LUCENE-7703?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15883579#comment-15883579
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Michael McCandless commented on LUCENE-7703:
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+1 to the patch.
> Record the version that was used at index creation time
> -------------------------------------------------------
>
> Key: LUCENE-7703
> URL: https://issues.apache.org/jira/browse/LUCENE-7703
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Priority: Minor
> Attachments: LUCENE-7703.patch
>
>
> SegmentInfos already records the version that was used to write a commit and
> the version that was used to write the oldest segment in the index. In
> addition to those, I think it could be useful to record the Lucene version
> that was used to create the index. I think it could help with:
> - Debugging: there are things that change based on Lucene versions, for
> instance we will reject broken offsets in term vectors as of 7.0. Knowing the
> version that was used to create the index can be very useful to know what
> assumptions we can make about an index.
> - Backward compatibility. The codec API helped simplify backward
> compatibility of the index files a lot. However for everything that is done
> on top of the codec API like analysis or the computation of length norm
> factors, backward compatibility needs to be handled on top of Lucene. Maybe
> we could simplify this?
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