code: func (o *ReplicaSetControllerOptions) ApplyTo(cfg *replicasetconfig.ReplicaSetControllerConfiguration) error {
  	if o == nil {
  		return nil
  	}
  
  	cfg.ConcurrentRSSyncs = o.ConcurrentRSSyncs
  
  	return nil
  }
docs: // ApplyTo fills up ReplicaSetController config with options.