[jira] [Created] (LUCENE-5940) change index backwards compatibility policy.

["Robert Muir (JIRA)" <ji...@apache.org>]

Robert Muir created LUCENE-5940:
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             Summary: 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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