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https://issues.apache.org/jira/browse/LUCENE-1483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12655832#action_12655832
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Mark Miller commented on LUCENE-1483:
-------------------------------------

bq. Could we leave (eg) TopDocCollector extending HitCollector in 2.9, and then 
in 3.0 change it to directly extend DocCollector (Hitable)? (This saves having 
to deprecate TopDocCollector and at least 2 others).

If we do that, I don't think we can do our check to use base or not by checking 
for HitCollector right?



> Change IndexSearcher to use MultiSearcher semantics for multiple subreaders
> ---------------------------------------------------------------------------
>
>                 Key: LUCENE-1483
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1483
>             Project: Lucene - Java
>          Issue Type: Improvement
>    Affects Versions: 2.9
>            Reporter: Mark Miller
>            Priority: Minor
>         Attachments: LUCENE-1483.patch, LUCENE-1483.patch, LUCENE-1483.patch, 
> LUCENE-1483.patch, LUCENE-1483.patch, LUCENE-1483.patch, LUCENE-1483.patch, 
> LUCENE-1483.patch, LUCENE-1483.patch
>
>
> FieldCache and Filters are forced down to a single segment reader, allowing 
> for individual segment reloading on reopen.

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