By default, the search is strict; meaning that if you search for group, we will search for the word "group". It will not find "groups" or "groupe". If you want disable the strict mode, use the character * before and after your query; *group*
You can create your query with LUCENE operators such as :
Note: we have deactivated the : operator.
If two words must appear in the search, it is necessary to put them between * * with the term "AND", for example * word1 * AND * word2 *.
If two words must appear in different posts and comments, they must be put between * * with the term "OR", for example * word1 * OR * word2 *.