fess supports single and multiple character wildcard search. Wildcard search performs indexed terms, not phrase.
To perform a single character wildcard search, use “?” symbol.
The above search looks for terms that match that with the single character replaced, such as text or test.
To perform a multiple character wildcard search, use “*” symbol.
Multiple character wildcard search looks for 0 or more characters, such as test, tests or tester.
You can also use the wildcard search in the middle of a term.
Wildcard search support terms, not phrase. If a word is indexed by bi-gram and so on, Wildcard search will not work properly. So, to use Wildcard search, a proper morphological analysis needs to be used.