code: protected function generateIndexView($dir)
      {
          $this->renderFile('crud/views/index.html.twig.twig', $dir.'/index.html.twig', array(
              'bundle' => $this->bundle->getName(),
              'entity' => $this->entity,
              'entity_pluralized' => $this->entityPluralized,
              'entity_singularized' => $this->entitySingularized,
              'identifier' => $this->metadata->identifier[0],
              'fields' => $this->metadata->fieldMappings,
              'actions' => $this->actions,
              'record_actions' => $this->getRecordActions(),
              'route_prefix' => $this->routePrefix,
              'route_name_prefix' => $this->routeNamePrefix,
          ));
      }
docs: Generates the index.html.twig template in the final bundle.
  
  @param string $dir The path to the folder that hosts templates in the bundle