Clean up some stuff

salt/elasticsearch/files/ingest/syslog

@@ -6,6 +6,10 @@
                 "field": "message",
                 "pattern" : "%{message}",
                 "on_failure": [ { "drop" : { } } ]
+        },
+        "remove": {
+                "field": [ "type", "agent" ],
+                "ignore_failure": true
         }
     },
     { "pipeline":       { "name": "common"                                             } }