Automatic failover - Mongoid 4.0.2 - mongoid

Question

Trying to test automatic failover using Mongoid 4.0.2 gem and using MongoDB 2.4.3
To simulate this I'm using this test code:
require 'mongoid'
class TestClass
include Mongoid::Document
store_in collection: "test", database: "test"
field :uuid, type: String
end
Mongoid.load!("config/mongoid.yml", :test)
batch = (1..100).map { |x| TestClass.new({ uuid: x }) }
batch.each_with_index { |x, i|
begin
x.save
sleep(5.seconds)
puts "Saved #{i} records" if i%10 == 0
rescue Exception => e
puts e.message
end
}
In between saves, I jumped on my MongoDB and did rs.stepDown() on the primary node of my Mongo cluster, unfortunately this results in the following errors in my test app:
See https://github.com/mongodb/mongo/blob/master/docs/errors.md
for details about this error.
Moped::Errors::OperationFailure
The operation: #<Moped::Protocol::Command
#length=68
#request_id=192
#response_to=0
#op_code=2004
#flags=[]
#full_collection_name="test.$cmd"
#skip=0
#limit=-1
#selector={:getlasterror=>1, :w=>1}
#fields=nil>
failed with error 10058: "not master"
My Mongoid configuration looks like thus:
test:
sessions:
default:
database: test_db
hosts:
- 192.168.1.10:27017
- 192.168.1.11:27017
options:
max_retries: 10
retry_interval: 1
Any idea what I'm doing wrong here? I thought the Mongoid driver would automatically detect changes in the cluster and automatically retry the request after it updates the cluster state on the client / Ruby side?