Cake\ElasticSearch\Datasource\Connection::getIndex PHP Method

    public function getIndex($name = null)
    {
        return parent::getIndex($name ?: $this->getConfig('index'));
    }

 /**
  * Returns an empty array as a shim for fixtures
  *
  * @return array An empty array
  */
 public function listTables()
 {
     try {
         $index = $this->connection->getIndex();
         $mappings = $index->getMapping();
     } catch (ResponseException $e) {
         return [];
     }
     return array_keys($mappings);
 }