{
    "facets": [ 
        {
            "field": "subject",
            "terms": { 
                "music": 15
            }
        },
        {
            "field": "creator",
            "terms": { 
                "eraserheads": 15
            }
        },
        {
            "field": "format",
            "terms": { 
                "video/mp4": 15
            }
        }
        
    ]
}