basic non relevant search is using the wrong query logic with more than 1 search term

[neongrau]

Aassuming you have addition filter criteria before full_text_search.

Then you get a query that combines the first term into the your previous criteria $and a global requirement for any further keywords. So this will need different indexes when using either a single term vs many terms search.

While this case should actually be Mymodel.some_criteria.where(:_keywords.all => Mongoid::Search::Util.normalize_keywords(term))