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https://issues.apache.org/jira/browse/LUCENE-5956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14135894#comment-14135894
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Ryan Ernst commented on LUCENE-5956:
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Regarding analysis, I think this is already a problem, since you may be using
the newest analysis chain, but have not rewritten these ancient 3x segments
which contain terms produced by the old analysis chain. But in reality, unless
drastic changes happen in analysis, this is usually "ok"? You will have some
terms that are never found in either direction, but it shouldn't break all
queries. So to be safe, you probably want to reindex your data at least every
major version, but if the data is ancient (for example, very old time based
indexes) perhaps just being able to search them at all is good? So with this
tool that makes it possible, vs trying to make the search uptodate as far as
analysis.
> Add runnable index upgrader
> ---------------------------
>
> Key: LUCENE-5956
> URL: https://issues.apache.org/jira/browse/LUCENE-5956
> Project: Lucene - Core
> Issue Type: New Feature
> Reporter: Ryan Ernst
>
> As a spinoff from discussion in LUCENE-5940, I'd like to add a new module
> "lucene-upgrader", move {{IndexUpgrader}} to this, and add embed older
> versions of lucene (just enough to upgrade indexes) in the built version of
> the module's jar. This would be runnable from the command line with
> something like:
> {{java -jar lucene-upgrader-4.11.0.jar /path/to/index}}
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