[Fleet] Give kibana_system delete privilege on .fleet-secrets index (#96080)

* [Fleet] Give kibana_system delete privilege on .fleet-secrets index

* Update docs/changelog/96080.yaml

* fix spelling

* Delete docs/changelog/96080.yaml

Author: hop-dev

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/security/authz/store/ReservedRolesStore.java

@@ -764,11 +764,11 @@ public static RoleDescriptor kibanaSystemRoleDescriptor(String name) {
                 RoleDescriptor.IndicesPrivileges.builder().indices("*").privileges("view_index_metadata", "monitor").build(),
                 // Endpoint diagnostic information. Kibana reads from these indices to send telemetry
                 RoleDescriptor.IndicesPrivileges.builder().indices(".logs-endpoint.diagnostic.collection-*").privileges("read").build(),
-                // Fleet secrets, Kibana can only write ot this index.
+                // Fleet secrets, Kibana can only write to this index.
                 // This definition must come before .fleet* below.
                 RoleDescriptor.IndicesPrivileges.builder()
                     .indices(".fleet-secrets*")
-                    .privileges("write", "create_index")
+                    .privileges("write", "delete", "create_index")
                     .allowRestrictedIndices(true)
                     .build(),
                 // Fleet Server indices. Kibana create this indice before Fleet Server use them.