Adrien Grand created LUCENE-7703:
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Summary: 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
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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