Specify Unicode blocks for replacement during filtering (to avoid 'corrupt' character display).
Can be set in: collection.cfg
This parameter lists the Unicode blocks of characters which should be removed by the
when it is used in the filter.classes config setting.
The list is expected to be comma separated, and contain names as listed in the defined unicode block
names. Block names
are case-insensitive (so
playing_cards are both permitted and are equivalent).
If both private use and playing card characters occur in documents but should not be shown in search results or cached copies: