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https://issues.apache.org/jira/browse/LUCENE-3540?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13138224#comment-13138224
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Uwe Schindler commented on LUCENE-3540:
---------------------------------------

I verified: The file shipped with TestBackwardsCompatibility has a single 
"segments" file with -1 as first int. An old pre-1.9 index has a positive 
number and this was excluded in LUCENE-3255.
                
> In 3.x branch (starting with 3.4) the IndexFormatTooOldException was 
> backported, but the error message was not modified for 3.x
> -------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-3540
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3540
>             Project: Lucene - Java
>          Issue Type: Bug
>    Affects Versions: 3.4
>            Reporter: Uwe Schindler
>            Assignee: Uwe Schindler
>             Fix For: 3.5
>
>         Attachments: LUCENE-3540.patch
>
>
> In 3.x branch (starting with 3.4) the IndexFormatTooOldException was 
> backported, but the error message was not modified for 3.x:
> bq. This version of Lucene only supports indexes created with release 3.0 and 
> later.
> In 3.x it must be:
> bq. This version of Lucene only supports indexes created with release 1.9 and 
> later.
> Indexes before 1.9 will throw this exception on reading SegmentInfos 
> (LUCENE-3255).

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