Elastica\Bulk\Action\IndexDocument::_getMetadata PHP Method

    protected function _getMetadata(AbstractUpdateAction $action)
    {
        $params = ['index', 'type', 'id', 'version', 'version_type', 'routing', 'parent', 'ttl', 'timestamp', 'retry_on_conflict'];
        $metadata = $action->getOptions($params, true);
        return $metadata;
    }