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https://issues.apache.org/jira/browse/LUCENE-5940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14130156#comment-14130156
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Robert Muir commented on LUCENE-5940:
-------------------------------------

The way i see it, back compat is just like any other feature. If people dont 
step up to contribute to make it happen, then we drop it. 

I'm done wasting days and days on it when i don't care about it.

> 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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