This is more of a mongodb issue, but need to know if I need to change my mongoid.yml OR if there is some security/role that needs enabled for the myAdmin Id.
Line in Ruby Code that is failing is highlighted in red. It appears this is a mongodb change in 3.4 where the local database is NOT accessible when security is enabled using the auth source below ( mongoid.yml ). Please advise ASAP. Thanks!

Mongoid ( yml ) entry:
development:
clients:
default:
uri: mongodb://qa1-web-db1:33478,qa1-web-db2:33478,qa1-web-db3:33478/eventmgr
options:
read:
mode: :primary_preferred
user: myAdminId
password: DONOTSHOW
auth_mech: :scram
auth_source: admin

Ruby method that is failing ( line in red is failing ) :

def oplog_entries

1. Oplog client can be found from any valid collection on the same mongo server as the local database, use Command.
   client = ContentIntegrationHub::Command.mongo_client.with(database: 'local')
2. Since this is a run-once thread, there's no need for a cursor. Just read the oplog since a time in the past.
   client['oplog.rs'].find({"ts" => {"$gte" => timestamp}}, sort: {'$natural' => 1})
   end

*ERROR is: *Mongo::Error::OperationFailure: not authorized on local to execute command { find: "oplog.rs", filter: { ts:

{ $gte: Timestamp 1497449043000|0 }

}, sort:

{ $natural: 1 }

} (13)