InitialNodeCount: The number of nodes to create in this cluster. You must ensure that your Compute Engine resource quota is sufficient for this number of instances. You must also have available firewall and routes quota. For requests, this field should only be used in lieu of a "node_pool" object, since this configuration (along with the "node_config") will be used to create a "NodePool" object with an auto-generated name. Do not use this and a node_pool at the same time.