Merge branch 'hk' into 'master'

add linucb 作者打散

See merge request alpha/physical!354

libs/es.py

@@ -416,8 +416,12 @@ class ESPerform(object):
                 "sort": [
                     {"_score": {"order": "desc"}},
                     {"create_time_val": {"order": "desc"}},
-                    {"language_type": {"order": "asc"}},
-                ]
+                    {"language_type": {"order": "asc"}}
+                ],
+                "collapse": {
+                    "field": "user_id"
+              }
+
             }
             if len(have_read_topic_id_list) > 0:
                 q["query"]["function_score"]["query"]["bool"]["must_not"] = {