MySQL 5.7 Release Notes
STOP GROUP_REPLICATION
Stops Group Replication on this server instance. This statement
requires the SUPER privilege.
Added in MySQL 5.7.6.
Warning
Use this statement with extreme caution because it removes the server instance from the group, meaning it is no longer protected by Group Replication's consistency guarantee mechanisms. To be completely safe, ensure that your applications can no longer connect to the instance before issuing this statement to avoid any chance of stale reads or inaccurate writes.