We have sharded cluster with one replica set rs1

When we call db.currentOp() trough mongos
it returns string in field "opid":"rs1:34234232342", when normally we expect to get number

db.killOp() doesn't support strings, so we cannot call db.killOp("rs1:34234232342")

What we understood, we can connect directly to replicaSet and run db.killOp(34234232342) // remove "rs1"

Then it works.

But why this cannot be done by mongo router itself? If it knows on which replica set operation is running, then it could route this killOp to appropriate RS. Its understandable that then function killOp() should accept also string, or add new param for replica identification