IndexFileNameFilter

[Yonghui Zhao]

In lucene 4.3.0 there is no IndexFileNameFilter.

And I find in org.apache.lucene.index.IndexFileNames the index file
extensions have  only 3 types.


public static final String INDEX_EXTENSIONS[] = new String[] {
    COMPOUND_FILE_EXTENSION,
    COMPOUND_FILE_ENTRIES_EXTENSION,
    GEN_EXTENSION,
  };


But there should be  many extensions  such as: fdt fdx fnm. ...

I want to know if there is any elegant way to filter these extensions
rather than list all extensions by myself.