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https://issues.apache.org/jira/browse/LUCENE-1483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12657410#action_12657410
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Michael McCandless commented on LUCENE-1483:
--------------------------------------------

{quote}
> so that they would know to implement that method for 3.0 when we would take 
> out the wrapper.
{quote}
Right but the new insight (for me at least) is it's OK for external collectors 
to not code to the expert API.

Ie previously we wanted to force migration to the expert API, but now I think 
it's OK to allow normal API and expert API to exist together.

> 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, 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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