searchlight/api-ref/source/samples/create-search-aggregation-request.json

{
    "query": {
        "match_all": {}
    },
    "type": ["OS::Glance::Image"],
    "limit": 0,
    "aggregations": {
        "name": {"terms": {"field": "name"}},
        "container_format": {"terms": {"field": "container_format"}}
    }
}