fix(search): Set dialect to None so arg is not passed to search

Default dialect was changed to 2 redis/redis-py#3467

Since we use old redis which doesn't recognize the DIALECT arg, set it
to None so it is not even passed

Author: balamurali27

helpdesk/search.py

@@ -161,6 +161,7 @@ def search(
         query.summarize(fields=["description"])
         query.scorer("DISMAX")
         query.with_scores()
+        query.dialect(None)
 
         try:
             result = self.redis.ft(self.index_name).search(query)