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https://issues.apache.org/jira/browse/LUCENE-4752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13598343#comment-13598343
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Shai Erera commented on LUCENE-4752:
------------------------------------

Well, first if you want to keep the index sorted even per-segment, you need 
some hooks so that segments that are merged stay sorted, otherwise, very 
quickly they'll just become arbitrarily sorted again.

About global sorting, I think that if we allow to terminate per-segment, then 
global sorting has lower priority (though still would be good if we can tackle 
that nicely) because it will be just like doing distributed search on a single 
index .. no big deal.
                
> Merge segments to sort them
> ---------------------------
>
>                 Key: LUCENE-4752
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4752
>             Project: Lucene - Core
>          Issue Type: New Feature
>          Components: core/index
>            Reporter: David Smiley
>            Assignee: Adrien Grand
>
> It would be awesome if Lucene could write the documents out in a segment 
> based on a configurable order.  This of course applies to merging segments 
> to. The benefit is increased locality on disk of documents that are likely to 
> be accessed together.  This often applies to documents near each other in 
> time, but also spatially.

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