diff --git a/metadata/service/server/single.yml b/metadata/service/server/single.yml
index 7dbc97d..2f61e70 100644
--- a/metadata/service/server/single.yml
+++ b/metadata/service/server/single.yml
@@ -16,3 +16,4 @@
         engine: elasticsearch
         host: localhost
         port: 9200
+        scheme: http