It would be great to have an index feature, so that when I am looking for an "address" it not only looks for it in the main field of the document, but also in the fields of the subdocuments. So it is an index on "address" AND "*.address". This way I can search for "phoneNumber" (e.g. using "*phoneNumber" as the search field name) and MongoDB has an index with all occurrences including "phoneNumber", "leader.phoneNUmber", "guests[].phoneNumber".