add create_time factor on home_recommend

search/utils/topic.py

@@ -136,6 +136,14 @@ class TopicUtils(object):
                             "decay": 0.5
                         }
                     }
+                },
+                {
+                    "gauss": {
+                        "create_time": {
+                            "scale": "1d",
+                            "decay": 0.8
+                        }
+                    }
                 }
             ]