docs: @SuppressWarnings("WeakerAccess")
    public CreateInstanceRequest addCluster(
        @Nonnull String clusterId,
        @Nonnull String zone,
        int serveNodes,
        @Nonnull StorageType storageType) {
      CreateClusterRequest clusterRequest =
          CreateClusterRequest.of("ignored-instance-id", clusterId)
              .setZone(zone)
              .setServeNodes(serveNodes)
              .setStorageType(storageType);
      clusterRequests.add(clusterRequest);
  
      return this;
    }