Add index template for CADF audit messages

Change-Id: Ia4289468a6022e0bfeea166d807385aa170d3888
diff --git a/metadata/service/client.yml b/metadata/service/client.yml
index fc57c7c..3527091 100644
--- a/metadata/service/client.yml
+++ b/metadata/service/client.yml
@@ -8,6 +8,9 @@
         log:
           enabled: true
           template: elasticsearch/files/es_template_log.json
+        audit:
+          enabled: true
+          template: elasticsearch/files/es_template_audit.json
         notification:
           enabled: true
           template: elasticsearch/files/es_template_notification.json