<p>Updates the number of broker nodes in the cluster.</p>
kafka_update_broker_count(ClusterArn, CurrentVersion,
TargetNumberOfBrokerNodes)
[required] <p>The Amazon Resource Name (ARN) that uniquely identifies the cluster.</p>
[required] <p>The version of cluster to update from. A successful operation will then generate a new version.</p>
[required] <p>The number of broker nodes that you want the cluster to have after this operation completes successfully.</p>
svc$update_broker_count( ClusterArn = "string", CurrentVersion = "string", TargetNumberOfBrokerNodes = 123 )