create method
Creates a cluster within an instance.
Note that exactly one of Cluster.serve_nodes and Cluster.cluster_config.cluster_autoscaling_config can be set. If serve_nodes is set to non-zero, then the cluster is manually scaled. If cluster_config.cluster_autoscaling_config is non-empty, then autoscaling is enabled.
request - The metadata request object.
Request parameters:
parent - Required. The unique name of the instance in which to create
the new cluster. Values are of the form
projects/{project}/instances/{instance}.
Value must have pattern ^projects/\[^/\]+/instances/\[^/\]+$.
clusterId - Required. The ID to be used when referring to the new
cluster within its instance, e.g., just mycluster rather than
projects/myproject/instances/myinstance/clusters/mycluster.
$fields - Selector specifying which fields to include in a partial
response.
Completes with a Operation.
Completes with a commons.ApiRequestError if the API endpoint returned an error.
If the used http.Client completes with an error when making a REST call,
this method will complete with the same error.
Implementation
async.Future<Operation> create(
  Cluster request,
  core.String parent, {
  core.String? clusterId,
  core.String? $fields,
}) async {
  final body_ = convert.json.encode(request);
  final queryParams_ = <core.String, core.List<core.String>>{
    if (clusterId != null) 'clusterId': [clusterId],
    if ($fields != null) 'fields': [$fields],
  };
  final url_ = 'v2/' + core.Uri.encodeFull('$parent') + '/clusters';
  final response_ = await _requester.request(
    url_,
    'POST',
    body: body_,
    queryParams: queryParams_,
  );
  return Operation.fromJson(response_ as core.Map<core.String, core.dynamic>);
}