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https://issues.apache.org/jira/browse/LUCENE-5850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14086153#comment-14086153
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Robert Muir commented on LUCENE-5850:
-------------------------------------

{quote}
The assumption you have is that it might happen that LUCENE_MAIN_VERSION is 
"4.9.1", which it can never be
{quote}

But it _should_ be if 4.9.1 is going to have any significant changes. Otherwise 
if we make a mistake, we cant correct it, as we will be unable to differentiate 
between 4.9 and 4.9.1 indexes.

This is a really big problem.

> Constants#LUCENE_MAIN_VERSION can have broken values 
> -----------------------------------------------------
>
>                 Key: LUCENE-5850
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5850
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: general/build
>    Affects Versions: 4.3.1, 4.5.1
>            Reporter: Simon Willnauer
>             Fix For: 5.0, 4.10
>
>         Attachments: LUCENE-5850.patch, LUCENE-5850.patch, LUCENE-5850.patch, 
> LUCENE-5850.patch, LUCENE-5850.patch, LUCENE-5850.patch, 
> LUCENE-5850_bomb.patch, LUCENE-5850_smoketester.patch
>
>
> Constants#LUCENE_MAIN_VERSION is set to the Lucene Main version and should 
> not contain minor versions. Well this is at least what I thought and to my 
> knowledge what the comments say too. Yet in for instance 4.3.1 and 4.5.1 we 
> broke this such that the version from SegmentsInfo can not be parsed with 
> Version#parseLeniently. IMO we should really add an assertion that this 
> constant doesn't throw an error and / or make the smoketester catch this. to 
> me this is actually a index BWC break. Note that 4.8.1 doesn't have this 
> problem...



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