/**
  * コンテンツデータを削除する
  * 
  * @param Model $model
  * @param string $id
  */
 public function deleteSearchIndex(Model $model, $id)
 {
     $this->SearchIndex = ClassRegistry::init('SearchIndex');
     if ($this->SearchIndex->deleteAll(array('SearchIndex.model' => $model->alias, 'SearchIndex.model_id' => $id))) {
         return $this->updateSearchIndexMeta($model);
     }
 }