modify linucb es bug

libs/es.py

@@ -302,7 +302,7 @@ class ESPerform(object):
                 ]
             }
             if len(have_read_topic_id_list)>0:
-                q["query"]["bool"]["must_not"] = {
+                q["query"]["function_score"]["query"]["bool"]["must_not"] = {
                     "terms":{
                         "id":have_read_topic_id_list
                     }