Merge branch 'feature/searth_topic' into 'master'

帖子添加时间排序

See merge request alpha/physical!93

search/utils/topic.py

@@ -506,8 +506,7 @@ class TopicUtils(object):
         """处理排序部分。"""
 
         sort_rule = []
-        for sort in sorts_by:
-            if sort == TOPIC_SEARCH_SORT.VOTE_NUM:
+        if sorts_by == TOPIC_SEARCH_SORT.VOTE_NUM:
             sort_rule.append({
                 "vote_num":{
                     "order":"desc"