Add support for 3.0 indexes in 2.9 branch
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Key: LUCENE-2675
URL: https://issues.apache.org/jira/browse/LUCENE-2675
Project: Lucene - Java
Issue Type: Improvement
Affects Versions: 2.9.3, 2.9.2, 2.9.1, 2.9
Reporter: Uwe Schindler
Assignee: Uwe Schindler
Priority: Minor
Fix For: 2.9.4
There was a lot of user requests to be able to read Lucene 3.0 indexes also
with 2.9. This would make the migration easier. There is no problem in doing
that, as the new stored fields version in Lucene 3.0 is only used to mark a
segment's stored fields file as no longer containing compressed fields. But
index format did not really change. This patch simply allows FieldsReader to
pass a Lucene 3.0 version number, but still writes segments in 2.9 format (as
you could suddenly turn on compression for added documents).
I added ZIP files for 3.0 indexes for TestBackwards. Without the patch it does
not pass, as FieldsReader complains about incorrect version number (although it
could read the file easily). If we would release maybe a 2.9.4 release of
Lucene we should include that patch.
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