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https://issues.apache.org/jira/browse/LUCENE-5940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14130149#comment-14130149
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Tim Smith commented on LUCENE-5940:
-----------------------------------

time based would be much more reasonable

as long as people are on a 4.x release that is less 1-2 years old, they should 
be able to move directly to 5.0

supporting indexes 4+ years old is asking a bit much, but assuming an external 
release cycle of 1 year, a 1-2 year cutoff is manageable


> 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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