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https://issues.apache.org/jira/browse/LUCENE-4190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13406521#comment-13406521
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Andi Vajda commented on LUCENE-4190:
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I think that the way to "bound" the namespace of files is to put everything in 
a subdirectory of the index directory chosen by the user and control the name 
of that subdirectory, making it clear that this is semi-private to Lucene and 
that all files in that subdirectory are fair game.
                
> IndexWriter deletes non-Lucene files
> ------------------------------------
>
>                 Key: LUCENE-4190
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4190
>             Project: Lucene - Java
>          Issue Type: Bug
>            Reporter: Michael McCandless
>            Assignee: Robert Muir
>             Fix For: 4.0
>
>         Attachments: LUCENE-4190.patch
>
>
> Carl Austin raised a good issue in a comment on my Lucene 4.0.0 alpha blog 
> post: 
> http://blog.mikemccandless.com/2012/07/lucene-400-alpha-at-long-last.html
> IndexWriter will now (as of 4.0) delete all foreign files from the index 
> directory.  We made this change because Codecs are free to write to any files 
> now, so the space of filenames is hard to "bound".
> But if the user accidentally uses the wrong directory (eg c:/) then we will 
> in fact delete important stuff.
> I think we can at least use some simple criteria (must start with _, maybe 
> must fit certain pattern eg _<base36>(_X).Y), so we are much less likely to 
> delete a non-Lucene file....

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