initial data, add index to notes

mongodb_backup/leanote_install_data/group_users.metadata.json

@@ -1 +1 @@
-{ "indexes" : [ { "v" : 1, "key" : { "_id" : 1 }, "name" : "_id_", "ns" : "leanote.group_users" } ] }
+{ "indexes" : [ { "v" : 1, "key" : { "_id" : 1 }, "ns" : "leanote_beta2.group_users", "name" : "_id_" } ] }