How to kill processes owned by rdsadmin user in aurora aws mysql DB?

Question

I have to kill processes owned by rdsadmin user in aurora aws mysql DB, for which I don't have access to.

I have tried to kill process by following ways, but it didn't work.

1. mysql> CALL mysql.rds_kill(9); ERROR 1054 (42S22): Unknown column 'ERROR (RDS): CANNOT KILL RDSADMIN SESSION' in 'field list'

2. mysql> kill 9; ERROR 1095 (HY000): You are not owner of thread 9