[DOCS] Disable Metricbeat system module

Author: lcawl

docs/reference/monitoring/configuring-metricbeat.asciidoc

@@ -81,6 +81,23 @@ Leave `xpack.monitoring.enabled` set to its default value (`true`).
 . {metricbeat-ref}/metricbeat-installation.html[Install {metricbeat}] on each
 {es} node in the production cluster.
 
+.. Optional: Disable the system module in {metricbeat}.
++
+--
+// tag::disable-system-module[]
+Run the following command:
+
+["source","sh",subs="attributes,callouts"]
+----------------------------------------------------------------------
+metricbeat modules disable system
+----------------------------------------------------------------------
+
+For more information, see 
+{metricbeat-ref}/configuration-metricbeat.html[Specify which modules to run] and
+{metricbeat-ref}/metricbeat-module-system.html[System module].
+// end::disable-system-module[] 
+--
+
 . Enable the {es} {xpack} module in {metricbeat} on each {es} node. +
 +
 --