Extending the File Based Index

I've implemented a ScalarIndexExtension extension.  However, I don't completely understand how the index uses my "keys" to associated with the files being indexed.  Is there documentation somewhere that sheds some light on the indexing process?

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I think I answered my own question.  I was finally able to trace throughing the indexing code and found how the "value" of the Map returned by the DataIndexer is used.  I never noticed the "FileBasedIndex.getValues(...)" method and the "FileBasedIndex.processValues(...)" method.

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