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https://issues.apache.org/jira/browse/LUCENE-4858?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13615761#comment-13615761
 ] 

Robert Muir commented on LUCENE-4858:
-------------------------------------

{quote}
I'm not trying to push for it, just curious what their use-cases are, they seem 
to be unused today?)
{quote}

They are not unused really, its a way for a codec to store special stuff that 
can then be read later. One use case today is backwards compat, for example 3.x 
codec stores lots of crazy stuff here that only it cares about, like shared doc 
store information :)

                
> Early termination with SortingMergePolicy
> -----------------------------------------
>
>                 Key: LUCENE-4858
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4858
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>            Priority: Minor
>             Fix For: 4.3
>
>
> Spin-off of LUCENE-4752, see 
> https://issues.apache.org/jira/browse/LUCENE-4752?focusedCommentId=13606565&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13606565
>  and 
> https://issues.apache.org/jira/browse/LUCENE-4752?focusedCommentId=13607282&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13607282
> When an index is sorted per-segment, queries that sort according to the index 
> sort order could be early terminated.

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