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$process = new Process('drush @self cache:rebuild -y');
$process->mustRun();

// or

$migrations = [
  'beg_building_group'
];

$options = [
  'execute-dependencies' => TRUE,
  'sync' => TRUE
];

$alias = Drush::service('site.alias.manager')->getSelf();
$process = Drush::drush($alias, 'migrate:import', [implode(',', $migrations)], $options);
$process->mustrun();