Clarifying purpose of index

Author: ycombinator

docs/en/stack/security/authorization/built-in-roles.asciidoc

@@ -77,16 +77,6 @@ suitable for use within a Logstash pipeline.
 ===============================
 --
 
-[[built-in-roles-beats-system]] `beats_system` ::
-Grants access necessary for the Beats system user to send system-level data
-(such as monitoring) to {es}.
-+
-NOTE: This role should not be assigned to users as the granted permissions may
-change between releases.
-+
-NOTE: This role does not provide access to the beats indices and is not
-suitable for writing beats output to {es}.
-
 [[built-in-roles-ml-admin]] `machine_learning_admin`::
 Grants `manage_ml` cluster privileges and read access to the `.ml-*` indices.