code: func (engine *DockerTaskEngine) cleanupPauseContainerNetwork(task *apitask.Task, container *apicontainer.Container) error {
  	seelog.Infof("Task engine [%s]: cleaning up the network namespace", task.Arn)
  
  	cniConfig, err := engine.buildCNIConfigFromTaskContainer(task, container)
  	if err != nil {
  		return errors.Wrapf(err,
  			"engine: failed cleanup task network namespace, task: %s", task.String())
  	}
  
  	return engine.cniClient.CleanupNS(engine.ctx, cniConfig, cniCleanupTimeout)
  }
docs: // cleanupPauseContainerNetwork will clean up the network namespace of pause container