Remove unused aggregation  subclasses (#1754)
Remove unused aggregation  subclasses (#1754)


andymccurdy/redis-py,alisaifee/redis-py,alisaifee/redis-py,mozillazg/redis-py-doc,mozillazg/redis-py-doc,andymccurdy/redis-py,redis/redis-py,andymccurdy/redis-py,redis/redis-py