Minor refactoring to IndexFileNameFilter
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                 Key: LUCENE-1499
                 URL: https://issues.apache.org/jira/browse/LUCENE-1499
             Project: Lucene - Java
          Issue Type: Improvement
          Components: Index
            Reporter: Shai Erera
            Priority: Minor
             Fix For: 2.4.1, 2.9


IndexFileNameFilter looks like it's designed to be a singleton, however its 
constructor is public and its singleton member is package visible. The proposed 
patch changes the constructor and member to private. Since it already has a 
static getFilter() method, and no code in Lucene references those two, I don't 
think it creates any problems from an API perspective.

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