Add missing allow_restricted_indices to cross cluster api key APIs (#3128)

Author: pquentin

specification/security/_types/Privileges.ts

@@ -418,6 +418,11 @@ export class ReplicationAccess {
    * A list of indices (or index name patterns) to which the permissions in this entry apply.
    */
   names: IndexName[]
+  /**
+   * This needs to be set to true if the patterns in the names field should cover system indices.
+   * @server_default false
+   */
+  allow_restricted_indices?: boolean
 }
 
 export class SearchAccess {