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https://issues.apache.org/jira/browse/LUCENE-2675?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12915506#action_12915506
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Robert Muir commented on LUCENE-2675:
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bq. Forget about Java versions
well its important to me, so I won't just forget about it. Especially to users
that don't know how their analysis works,
they do not know that java 1.4 is unicode 3.x and java 5 is unicode 4.x and
harmony java5 is unicode 5.2 and java 6 is unicode 6.0.
But this is even just part of the issue, i don't think we should do this. it
adds too much confusion to be officially supported in any release.
furthermore its not like it can be duplicated with 4.0, i would be against
adding 4.x index support to 3.x also, forget about in a bugfix release.
historically lucene has been held back by backwards compatibility, lets not
throw forward compatibility into the mix.
bq. If we would not have removed compression in 3.0, the file format would have
been identical.
a great example of why major release shouldn't be just removal of deprecations.
> Add support for 3.0 indexes in 2.9 branch
> -----------------------------------------
>
> Key: LUCENE-2675
> URL: https://issues.apache.org/jira/browse/LUCENE-2675
> Project: Lucene - Java
> Issue Type: Improvement
> Affects Versions: 2.9, 2.9.1, 2.9.2, 2.9.3
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
> Priority: Minor
> Fix For: 2.9.4
>
> Attachments: index.30.cfs.zip, index.30.nocfs.zip, LUCENE-2675.patch
>
>
> 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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