Add esql-ccs to the list of feature usage notifications

Author: sakurai-youhei

deploy-manage/cloud-organization/billing/manage-subscription.md

@@ -72,6 +72,9 @@ You can [change your subscription level](/deploy-manage/cloud-organization/billi
 `Field-level or document-level security`
 :   Remove any user role configurations based on field or document access [through the API](/deploy-manage/users-roles/cluster-or-deployment-auth/controlling-access-at-document-field-level.md) or the {{kib}} [Roles](/deploy-manage/users-roles/cluster-or-deployment-auth/defining-roles.md) page.
 
+`ES|QL cross-cluster search`
+:   Discontinue all [ES|QL CCS queries](elasticsearch://reference/query-languages/esql/esql-cross-clusters.md) or upgrade license tier to Enterprise.
+
 ::::{note}
 After you have made your changes to the deployment, it can take up to one hour to clear the notification banner.
 ::::