[DOCS] Update ml.enabled description (elastic/x-pack-elasticsearch#2148)
Original commit: elastic/x-pack-elasticsearch@816f815e02e53da9ba4e7a02be94471ed1113eb2
@@ -12,7 +12,8 @@ Set to `true` (default) to enable {ml}. +
+
If set to `false` in `elasticsearch.yml`, the {ml} APIs are disabled.
You also cannot open jobs, start {dfeeds}, or receive transport (internal)
-communication requests related to {ml} APIs. +
+communication requests related to {ml} APIs. The {ml} icon is also not visible
+in all {kib} instances that connect to this {es} instance. +
+
IMPORTANT: If you want to use {ml} features in your cluster, you must have
`xpack.ml.enabled` set to `true` on all master-eligible nodes. This is the
