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https://issues.apache.org/jira/browse/LUCENE-5952?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14135386#comment-14135386
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Michael McCandless commented on LUCENE-5952:
--------------------------------------------

{quote}
bq. I don't think this should wait for 5.0
Just not in 4.10.1, we just have a bugfix release and the whole thing did not 
change since 4.0. We can change that for 4.11, but as Robert suggested to 
release 4.11 as 5.0 (after copy branch and merge some more stuff in), I wrote 
"5.0".
{quote}

OK I see...

I'll revert that change here (for 4.10.1) but put it back when I port to 4.x / 
5.0.

bq. -1 to it throwing IndexFormatTooOld/New for this reasons from here. It 
makes no sense.

I agree ...

> Make Version.java lenient again?
> --------------------------------
>
>                 Key: LUCENE-5952
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5952
>             Project: Lucene - Core
>          Issue Type: Bug
>    Affects Versions: 4.10
>            Reporter: Michael McCandless
>            Priority: Blocker
>             Fix For: 4.10.1, 4.11, 5.0
>
>         Attachments: LUCENE-5952.patch, LUCENE-5952.patch
>
>
> As discussed on the dev list, it's spooky how Version.java tries to fully 
> parse the incoming version string ... and then throw exceptions that lack 
> details about what invalid value it received, which file contained the 
> invalid value, etc.
> It also seems too low level to be checking versions (e.g. is not future proof 
> for when 4.10 is passed a 5.x index by accident), and seems redundant with 
> the codec headers we already have for checking versions?
> Should we just go back to lenient parsing?



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