Document DLS configuration within Kibana role management (#90329) (#94165)

Co-authored-by: gchaps <33642766+gchaps@users.noreply.github.com>
Co-authored-by: Joe Portner <5295965+jportner@users.noreply.github.com>
Co-authored-by: Kibana Machine <42973632+kibanamachine@users.noreply.github.com>

Co-authored-by: Larry Gregory <larry.gregory@elastic.co>
Co-authored-by: gchaps <33642766+gchaps@users.noreply.github.com>
Co-authored-by: Joe Portner <5295965+jportner@users.noreply.github.com>

docs/user/security/authorization/index.asciidoc

@@ -13,15 +13,71 @@ you cannot use `kibana_admin` to grant access. You must create custom roles that
 [[kibana-role-management]]
 === {kib} role management
 
-To create a role that grants {kib} privileges, open the menu, then click *Stack Management > Roles* and click **Create role**.
+Roles are a collection of privileges that allow you to perform actions in {kib} and {es}. Users are not directly granted privileges, but are instead assigned one or more roles that describe the desired level of access. When you assign a user multiple roles, the user receives a union of the roles’ privileges. This means that you cannot reduce the privileges of a user by assigning them an additional role. You must instead remove or edit one of their existing roles.
+
+To create a role, open the menu, then click *Stack Management > Roles* and click **Create role**.
 
 [float]
 ==== Required permissions
 
-The `manage_security` cluster privilege is required to access role management.
+The `manage_security` {ref}/security-privileges.html#privileges-list-cluster[cluster privilege] is required to access role management.
+
+[[adding_cluster_privileges]]
+==== Cluster privileges
+
+Cluster privileges grant access to monitoring and management features in {es}. They also enable <<management, Stack Management>> capabilities in {kib}.
+
+Refer to {ref}/security-privileges.html#privileges-list-cluster[cluster privileges] for a complete description of available options.
+
+[[adding_index_privileges]]
+==== Index privileges
+
+Each role can grant access to multiple data indices, and each index can have a different set of privileges.
+We recommend granting the `read` and `view_index_metadata` privileges to each index that you expect your users to work with in {kib}.
+
+Refer to {ref}/security-privileges.html#privileges-list-indices[index privileges] for a complete description of available options.
+
+Document-level and field-level security affords you even more granularity when it comes to granting access to your data.
+With document-level security (DLS), you can write an {es} query to describe which documents this role grants access to.
+With field-level security (FLS), you can instruct {es} to grant or deny access to specific fields within each document.
+
+[[index_privilege_example_1]]
+===== Example: Grant access to indices that match the `filebeat-*` pattern
+
+. Go to **Stack Management > Roles**, and then click **Create role**.
+. In **Index privileges**, enter:
+.. `filebeat-*` in the **Index** field.
+.. `read` and `view_index_metadata` in the **Privileges** field.
+
+[role="screenshot"]
+image::user/security/images/create-role-index-example.png[Create role with index privileges]
+
+[[index_privilege_dls_example]]
+===== Example: Grant read access to specific documents in indices that match the `filebeat-*` pattern
+
+. Go to **Stack Management > Roles**, and then click **Create role**.
+. In **Index privileges**, enter:
+.. `filebeat-*` in the **Indices** field.
+.. `read` and `view_index_metadata` in the **Privileges** field.
+. Select **Grant read privileges to specific documents**.
+. Enter an {es} query that matches the documents your users should access. This example writes a query that allows access to documents that have a `category` field equal to `click`:
++
+[source,sh]
+--------------------------------------------------
+{
+  "match": {
+    "category": "click"
+  }
+}
+--------------------------------------------------
++
+NOTE: {kib} automatically surrounds your DLS query with a `query` block, so you don't have to provide your own.
+
+[role="screenshot"]
+image::user/security/images/create-role-dls-example.png[Create role with DLS index privileges]
 
 [[adding_kibana_privileges]]
-==== Adding {kib} privileges
+==== {kib} privileges
 
 To assign {kib} privileges to the role, click **Add {kib} privilege** in the {kib} section.