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https://issues.apache.org/jira/browse/LUCENE-5182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13744987#comment-13744987
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Simon Willnauer commented on LUCENE-5182:
-----------------------------------------

I agree robert we don't really fix the problem for high slops. I am not sure 
what a good default is for that but maybe it's just enough to make it 
configurable?
                
> FVH can end in very very long running recursion on phrase highlight
> -------------------------------------------------------------------
>
>                 Key: LUCENE-5182
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5182
>             Project: Lucene - Core
>          Issue Type: Bug
>    Affects Versions: 5.0, 4.4
>            Reporter: Simon Willnauer
>            Assignee: Simon Willnauer
>             Fix For: 5.0, 4.5
>
>         Attachments: LUCENE-5182.patch
>
>
> due to the nature of FVH extract logic a simple phrase query can put a FHV 
> into a super long running recursion. I had documents taking literally days to 
> return form the extract phrases logic. I have a test that reproduces the 
> problem and a possible fix. The reason for this is that the FVH never tries 
> to early terminate if a phrase is already way beyond the slop coming from the 
> phrase query. If there is a document with lot of occurrences or two or more 
> terms in the phrase this literally tries to match all possible combinations 
> of the terms in the doc. 

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