src/DependencyInjection/Configuration.php
private function getIdNode()
    {
        $node = $this->createTreeBuilderNode('_id');

        $node
            ->children()
            ->scalarNode('path')->end()
            ->end()
        ;

        return $node;
    }
private function getIdNode()
    {
        $node = $this->createTreeBuilderNode('_id');

        $node
            ->children()
            ->scalarNode('path')->end()
            ->end()
        ;

        return $node;
    }
Returns the array node used for "_id".