> ## Documentation Index
> Fetch the complete documentation index at: https://doc.lucidworks.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Configuring the Hierarchical Facet Service
export const LwTemplate = ({title = "Key questions to get you started", icon = "sparkles", cta = "Powered by Agent Studio", linkHref = "https://lucidworks.com/demo/?utm_source=docs&utm_medium=referral&utm_campaign=docs_cta_ai"}) => {
const [isLoaded, setIsLoaded] = useState(false);
useEffect(() => {
const timer = setTimeout(() => {
setIsLoaded(true);
}, 500);
return () => clearTimeout(timer);
}, []);
return
{isLoaded && `
}} />}
Powered by Lucidworks Agent Studio
;
};
[localhost link]: http://localhost:3000/docs/4/app-studio/reference/search-platforms/solr/hierarchical-facet-service
[old doc.lw link]: https//doc.lucidworks.com/app-studio/4.2/3203
[mintlify link]: https://doc.lucidworks.com/docs/4/app-studio/reference/search-platforms/solr/hierarchical-facet-service
To correctly display a taxonomy as a hierarchical facet you must configure the requisite Appkit service to retrieve the data structure that is configured in your Solr index.
First you must create a service configuration:
```bash wrap theme={"dark"}
/conf
/services
/hierarchical
/hierarchical.conf
```
The file 'hierarchical.conf' should be configured similar to this example:
```yml wrap theme={"dark"}
name: twigkit.search.solr.service.facet.GreedySolrHierarchicalFacetService
platform: platforms.solr
parents-suffix: _parent
```
`platform`\
This specifies the configured platform where the taxonomy has been indexed.
`parents-suffix`\
The suffix that, if appended to the facet’s fieldname, designates the field containing parent node data. The suffix will depend on how the taxonomy data has been indexed.
This service configuration is what is used when adding the hierarchical facet to your HTML page as in this example:
```xml wrap theme={"dark"}
```