PRIMARY> cfg1 = rs.conf();
{
"_id" : "s0",
"version" : 13,
"members" : [

{ "_id" : 1, "host" : "ec2-184-72-40-101.us-west-1.compute.amazonaws.com:27017" }

,

{ "_id" : 4, "host" : "ec2-50-18-172-228.us-west-1.compute.amazonaws.com:27017" }

,

{ "_id" : 5, "host" : "ec2-184-169-145-5.us-west-1.compute.amazonaws.com:27017" }

,

{ "_id" : 3, "host" : "ec2-184-169-155-143.us-west-1.compute.amazonaws.com:27017", "priority" : 0, "hidden" : true, "buildIndexes" : false }

,

{ "_id" : 6, "host" : "50.23.75.130:28000" }

]
}
PRIMARY> cfg1.members[6].priority = 2;
Sat Jul 28 00:53:27 TypeError: cfg1.members[6] has no properties (shell):1