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.