[DOCS] Add manage_ilm privilege to monitoring steps (#58141)

docs/reference/monitoring/configuring-metricbeat.asciidoc

@@ -169,9 +169,13 @@ provide a valid user ID and password so that {metricbeat} can send metrics
 successfully: 
 
 .. Create a user on the monitoring cluster that has the 
-<<built-in-roles,`remote_monitoring_agent` built-in role>>. 
-Alternatively, use the 
-<<built-in-users,`remote_monitoring_user` built-in user>>.
+<<built-in-roles,`remote_monitoring_agent` built-in role>> or use the 
+<<built-in-users,`remote_monitoring_user` built-in user>>. If you want to use
+{ilm} features on your {metricbeat} indices, the user must also have
+<<security-privileges,`manage_ilm` cluster privileges>>. If {metricbeat} is
+monitoring only the {stack}, {ilm-init} is not required. Disable it by adding
+`setup.ilm.enabled: false` to your {metricbeat} configuration file. For more
+information, refer to {metricbeat-ref}/ilm.html[Configure {ilm} in {metricbeat}].
 
 .. Add the `username` and `password` settings to the {es} output information in 
 the {metricbeat} configuration file.