Switch Elasticsearch to 5 version

Change-Id: Ic5f0937b6288b181a6b8708a85173ad15eb4d65c
diff --git a/metadata/service/server/local.yml b/metadata/service/server/local.yml
index 24f577e..7980251 100644
--- a/metadata/service/server/local.yml
+++ b/metadata/service/server/local.yml
@@ -4,7 +4,7 @@
 - service.elasticsearch.support
 parameters:
   _param:
-    elasticsearch_version: 2
+    elasticsearch_version: 5
   elasticsearch:
     server:
       enabled: true