private function addIndexerSection(ArrayNodeDefinition $node)
    {
        $node
            ->children()
                ->arrayNode('indexer')
                    ->addDefaultsIfNotSet()
                    ->children()
                        ->booleanNode('sudo')->defaultValue(false)->end()
                        ->scalarNode('bin')->defaultValue('/usr/bin/indexer')->end()
                        ->scalarNode('config')->defaultNull()->end()
                    ->end()
                ->end()
            ->end();
    }