code: public ServiceFuture<Void> createAsync(String resourceGroupName, String clusterName, String extensionName, ExtensionInner parameters, final ServiceCallback<Void> serviceCallback) {
          return ServiceFuture.fromResponse(createWithServiceResponseAsync(resourceGroupName, clusterName, extensionName, parameters), serviceCallback);
      }
docs: Creates an HDInsight cluster extension.
  
  @param resourceGroupName The name of the resource group.
  @param clusterName The name of the cluster.
  @param extensionName The name of the cluster extension.
  @param parameters The cluster extensions create request.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object