diff --git a/collection/uni-stat-error-logs/collection.json b/collection/uni-stat-error-logs/collection.json
index 7f6e09c..1056db5 100644
--- a/collection/uni-stat-error-logs/collection.json
+++ b/collection/uni-stat-error-logs/collection.json
@@ -169,11 +169,11 @@
             }
         },
         {
-            "IndexName":"hash",
+            "IndexName":"error_hash",
             "MgoKeySchema":{
                 "MgoIndexKeys":[
                     {
-                        "Name":"hash",
+                        "Name":"error_hash",
                         "Direction":"1"
                     }
                 ],
@@ -181,4 +181,4 @@
             }
         }
     ]
-}
\ No newline at end of file
+}
diff --git a/collection/uni-stat-page-logs/collection.json b/collection/uni-stat-page-logs/collection.json
index 734ae1c..8f0b878 100644
--- a/collection/uni-stat-page-logs/collection.json
+++ b/collection/uni-stat-page-logs/collection.json
@@ -224,6 +224,18 @@
                 ],
                 "MgoIsUnique":false
             }
+        },
+        {
+          "IndexName":"previous_page_duration",
+          "MgoKeySchema":{
+              "MgoIndexKeys":[
+                  {
+                      "Name":"previous_page_duration",
+                      "Direction":"1"
+                  }
+              ],
+              "MgoIsUnique":false
+          }
         }
     ]
-}
\ No newline at end of file
+}