Detail for specified facet

`facet_id`: "topics", "facility", "format", "genre", or "rights".

GET /api/0.2/facet/topics/?format=api
HTTP 200 OK
Allow: OPTIONS, GET
Content-Type: application/json
Vary: Accept

{
    "id": "topics",
    "model": "ddrfacet",
    "links": {
        "html": "https://ddr.densho.org/topics/?format=api",
        "json": "https://ddr.densho.org/api/0.2/facet/topics/?format=api",
        "children": "https://ddr.densho.org/api/0.2/facet/topics/children/?format=api"
    },
    "title": "Topics",
    "description": "'DDR Topics'"
}