'Returns a type which identifies which modulestore is servicing the given course_id.
The return can be one of:
"xml" (for XML based courses),
"mongo" for old-style MongoDB backed courses,
"split" for new-style split MongoDB backed courses.'

def get_modulestore_type(self, course_id):

    return self._get_modulestore_for_courselike(course_id).get_modulestore_type()
