Stopping Group Replication on a DB instance in an active-active cluster
You can stop Group Replication  on a DB instance in an active-active
            cluster. When you stop Group Replication, the DB instance is placed in super-read-only
            mode until replication is restarted or that DB instance is removed from the
            active-active cluster. For information about super-read-only mode, see the  MySQL documentation
To stop Group Replication temporarily for an active-active cluster
- 
                Connect to a DB instance in the active-active cluster using a SQL client. For more information about connecting to an RDS for MySQL DB instance, see Connecting to your MySQL DB instance. 
- 
                In the SQL client, call the mysql.rds_group_replication_stop stored procedure: call mysql.rds_group_replication_stop();