diff --git a/metadata/service/server/router.yml b/metadata/service/server/router.yml
index a850e22..31fddb2 100644
--- a/metadata/service/server/router.yml
+++ b/metadata/service/server/router.yml
@@ -56,5 +56,5 @@
           engine: es-json
           message_matcher: TRUE
           index: logfile-%{%Y.%m.%d}
-          es_index_from_timestamp: yes
+          es_index_from_timestamp: "yes"