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https://issues.apache.org/jira/browse/LUCENE-5940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14130324#comment-14130324
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Tim Smith commented on LUCENE-5940:
-----------------------------------

bq. Because you are not even considering the developer pain. The tests man, 
maintaining the tests.

the pain will continue to exist, you are just shifting who feels it. again, i 
get how painful it is, but best to have that pain felt at the source (and 
handled properly and consistently by people who fully understand it) as opposed 
to pushing it all downstream, polluting the waters

> 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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