Find the total access count of all documents in the most popular document type.
return documents ;return types of #1 ;return number of  #1 for each #2 ;return #2 where #3 is  the  highest ;return #1 where #2 is  #4 ;return access counts of #5 ;return sum of #6
['select', 'project', 'group', 'comparative', 'comparative', 'project', 'aggregate']