loadThread example

// Only attempt to render comments if the entity has visible comments.       // Unpublished comments are not included in       // $entity->get($field_name)->comment_count, but unpublished comments       // should display if the user is an administrator.       $elements['#cache']['contexts'][] = 'user.permissions';
      if ($this->currentUser->hasPermission('access comments') || $this->currentUser->hasPermission('administer comments')) {
        $output['comments'] = [];

        if ($entity->get($field_name)->comment_count || $this->currentUser->hasPermission('administer comments')) {
          $mode = $comment_settings['default_mode'];
          $comments_per_page = $comment_settings['per_page'];
          $comments = $this->storage->loadThread($entity, $field_name, $mode, $comments_per_page, $this->getSetting('pager_id'));
          if ($comments) {
            $build = $this->viewBuilder->viewMultiple($comments, $this->getSetting('view_mode'));
            $build['pager']['#type'] = 'pager';
            // CommentController::commentPermalink() calculates the page number             // where a specific comment appears and does a subrequest pointing to             // that page, we need to pass that subrequest route to our pager to             // keep the pager working.             $build['pager']['#route_name'] = $this->routeMatch->getRouteName();
            $build['pager']['#route_parameters'] = $this->routeMatch->getRawParameters()->all();
            if ($this->getSetting('pager_id')) {
              $build['pager']['#element'] = $this->getSetting('pager_id');
            }