add logging

search/utils/topic.py

@@ -514,7 +514,7 @@ class TopicUtils(object):
                 }
 
             if len(topic_tag_list) > 0:
-                query_function_score["query"]["bool"]["should"] += {
+                query_function_score["query"]["bool"]["should"] = {
                     "terms": {
                         "tag_list": topic_tag_list
                     }