code: public void start(String groupName, String serviceName) {
          startWithServiceResponseAsync(groupName, serviceName).toBlocking().last().body();
      }
docs: Start service.
  The services resource is the top-level resource that represents the Data Migration Service. This action starts the service and the service can be used for data migration.
  
  @param groupName Name of the resource group
  @param serviceName Name of the service
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws ApiErrorException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent