public QueryInterface::sort($field, $direction = 'ASC', $langcode = NULL)
$field: Name of a field.
string $direction:
$langcode: Language code (optional).
\Drupal\Core\Entity\Query\QueryInterface The called object.
public function sort($field, $direction = 'ASC', $langcode = NULL);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!Query!QueryInterface.php/function/QueryInterface::sort/8.1.x