Filters specifying documents not to index in the selected folders.

Filename filters apply to the FoldersToIndex. Documents returned by a DataSource are not filtered. 

A file will be indexed if it matches one of the IncludeFilters and does not match any of the ExcludeFilters. 

A filename filter that does not contain a slash is compared to the name of each file. A filename filter that contains a slash is compared to the fully-qualified pathname of each file.