private function addSearchdSection(ArrayNodeDefinition $node)
    {
        $node
            ->children()
                ->arrayNode('searchd')
                ->addDefaultsIfNotSet()
                    ->children()
                        ->scalarNode('host')->defaultValue('localhost')->end()
                        ->scalarNode('port')->defaultValue('9312')->end()
                        ->scalarNode('socket')->defaultNull()->end()
                    ->end()
                ->end()
            ->end();
    }