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https://issues.apache.org/jira/browse/LUCENE-5940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14130493#comment-14130493
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Michael McCandless commented on LUCENE-5940:
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+1 to relax the policy
+1 for the ".99" approach: I think it's easier to "grok" than the time-based
approach.
But if we do relax the policy I think we should also improve IndexUpgrader (or
make a new top-level tool, which is what we expose to users, hiding the current
IndexUpgrader, i.e. [~rjernst]'s idea) to do this upgrade across any 4.x to any
5.x (or across more than 1 major release).
> change index backwards compatibility policy.
> --------------------------------------------
>
> Key: LUCENE-5940
> URL: https://issues.apache.org/jira/browse/LUCENE-5940
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
>
> Currently, our index backwards compatibility is unmanageable. The length of
> time in which we must support old indexes is simply too long.
> The index back compat works like this: everyone wants it, but there are
> frequently bugs, and when push comes to shove, its not a very sexy thing to
> work on/fix, so its hard to get any help.
> Currently our back compat "promise" is just a broken promise, because we
> cannot actually guarantee it for these reasons.
> I propose we scale back the length of time for which we must support old
> indexes.
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