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https://issues.apache.org/jira/browse/LUCENE-3434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13170051#comment-13170051
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Simon Arame commented on LUCENE-3434:
-------------------------------------

As of Lucene 3.4.0, the default Analyzer of PerFieldAnalyzerWrapper is not 
loaded when searching documents only with fields in the exception list.
                
> Make ShingleAnalyzerWrapper and PerFieldAnalyzerWrapper immutable
> -----------------------------------------------------------------
>
>                 Key: LUCENE-3434
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3434
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: modules/analysis
>            Reporter: Chris Male
>            Assignee: Chris Male
>             Fix For: 3.5, 4.0
>
>         Attachments: LUCENE-3434-3x.patch, LUCENE-3434-trunk.patch
>
>
> Both ShingleAnalyzerWrapper and PerFieldAnalyzerWrapper have setters which 
> change some state which impacts their analysis stack.  If these are going to 
> become reusable, then the state must be immutable as changing it will have no 
> effect.
> Process will be similar to QueryAutoStopWordAnalyzer, I will remove in trunk 
> and deprecate in 3x.

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