Mute failing ML datafeed docs code snippet
Original commit: elastic/x-pack-elasticsearch@2a309e63a63dac710bf5df74110745fd92266b3a
@@ -66,7 +66,7 @@ The following example gets usage information for the
GET _xpack/ml/datafeeds/datafeed-total-requests/_stats
--------------------------------------------------
// CONSOLE
-// TEST[setup:server_metrics_startdf]
+// TEST[skip:https://github.com/elastic/x-pack-elasticsearch/issues/4004]
The API returns the following results:
[source,js]
