Current implementation combines multiple facets from the same group by OR-ing them (SHOULD):
It might be useful to also allow AND-ing the facets.
When searching for publications, I want the publications where both 'Kim' and 'John' are author
When searching for recipes, I want meals with both 'tomatoes' and 'eggs'.
This is in case of fields that might have mutliple values, so its working is relying on HSEARCH-726.
I currently have adapted the code myself, to be able to set AND/OR as default facet combinator, but this is not using the Hibernate Search Query language contexts. This improvement should be easy to implement.