public function getMatches($target_type, $selection_handler, $selection_settings, $string = '') {
    $matches = [];
    $options = [
      'target_type'      => $target_type,
      'handler'          => $selection_handler,
      'handler_settings' => $selection_settings,
    ];

    $handler = $this->selectionManager->getInstance($options);
    if (isset($string)) {
      // Get an array of matching entities.
      $match_operator = !empty($selection_settings['match_operator']) ? $selection_settings['match_operator'] : 'CONTAINS';
      $entity_labels = $handler->getReferenceableEntities($string, $match_operator, 100);
      // Loop through the entities and convert them into autocomplete output.
      foreach ($entity_labels as $values) {
        foreach ($values as $entity_id => $label) {
          $entity = $this->entityTypeManager->getStorage($target_type)->load($entity_id);
          $entity = $this->entityManager->getTranslationFromContext($entity);

          $status = '';
          $alias = '';

          if ($entity->getEntityType()->id() == 'node') {
            $alias = $this->aliasManager->getAliasByPath('/node/' . $entity_id);
            $status = ($entity->isPublished()) ? t("Published") : t("Unpublished");
          }

          $key = $label . ' (' . $entity_id . ')';
          // Strip things like starting/trailing white spaces, line breaks and tags.
          $key = preg_replace('/\s\s+/', ' ', str_replace("\n", '', trim(Html::decodeEntities(strip_tags($key)))));

          // Names containing commas or quotes must be wrapped in quotes.
          $key = Tags::encode($key);

          $prefix = (empty($matches)) ? '' : '<hr />';
          $label = $prefix . $label;
          if ($alias || $status) {
            $label .= sprintf(' [%s]', implode(', ', array_filter([$status, $alias])));
          }

          $matches[] = ['value' => $key, 'label' => $label];
        }
      }
    }

    return $matches;
  }