Terms for specified facet

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

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

{
    "total": 3,
    "page_size": 25,
    "prev": null,
    "next": null,
    "hits": [],
    "aggregations": {},
    "objects": [
        {
            "id": "public-1",
            "model": "ddrfacetterm",
            "facet": "public",
            "term_id": "1",
            "links": {
                "json": "https://ddr.densho.org/api/0.2/facet/public/1/?format=api",
                "html": "https://ddr.densho.org/browse/public/1/?format=api",
                "objects": "https://ddr.densho.org/api/0.2/facet/public/1/objects/?format=api"
            },
            "title": "Public"
        },
        {
            "id": "public-0",
            "model": "ddrfacetterm",
            "facet": "public",
            "term_id": "0",
            "links": {
                "json": "https://ddr.densho.org/api/0.2/facet/public/0/?format=api",
                "html": "https://ddr.densho.org/browse/public/0/?format=api",
                "objects": "https://ddr.densho.org/api/0.2/facet/public/0/objects/?format=api"
            },
            "title": "Private"
        }
    ]
}