Add missing JSON format for dashboard
diff --git a/elasticsearch/meta/grafana.yml b/elasticsearch/meta/grafana.yml
index 4fa8b0d..301ac05 100644
--- a/elasticsearch/meta/grafana.yml
+++ b/elasticsearch/meta/grafana.yml
@@ -1,3 +1,4 @@
 dashboard:
   elasticsearch:
+    format: json
     template: elasticsearch/files/grafana_influxdb.json