Application\Admin\Controllers\TaskController::stopAction PHP Method

    public function stopAction()
    {
        $taskId = $this->request->get('task', 'ignore');
        if (isset($this->_tasks[$taskId])) {
            $taskName = $this->_tasks[$taskId];
            $this->tasksMetadata->set($taskName, Metadata::FIELD_CANCEL_FLAG, 1);
        }
        return $this->response->redirect('/admin/task');
    }