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https://issues.apache.org/jira/browse/LUCENE-2102?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12784424#action_12784424
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Robert Muir commented on LUCENE-2102:
-------------------------------------

bq. Maybe its just me, but I think it is critical to normalize the input to 
Lucene for both indexing and searching. Unless a NFCNormalizingFilter is added 
to Lucene, I think it is the responsibility of the caller.

yeah I think its critical too.

bq. It might be good to note the NFC (NFKC?) requirement in the JavaDoc. 

yeah or maybe just a hint in the comments (because this is an exceptionally 
tricky case). 
this same problem also applies to ASCIIFoldingFilter, pretty much all of the 
analyzers, etc too...


> LowerCaseFilter for Turkish language
> ------------------------------------
>
>                 Key: LUCENE-2102
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2102
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Analysis
>    Affects Versions: 3.0
>            Reporter: Ahmet Arslan
>            Assignee: Robert Muir
>            Priority: Minor
>             Fix For: 3.1
>
>         Attachments: LUCENE-2102.patch
>
>
> java.lang.Character.toLowerCase() converts 'I' to 'i' however in Turkish 
> alphabet lowercase of 'I' is not 'i'. It is LATIN SMALL LETTER DOTLESS I.

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