How to make killop role


I am running stand-alone MongoDb server. I want user that has Cluster Moniter Built-in role and killop action privilege.

I tried making user defined role that has killop privilege. Then granted role to my user. But this dont work. when I tried to run db.killOp(1) on admin db, gives me not authorized on admin to run command.

when i switch to root db.killop(1) works fine.