{
    "facets": [ 
        {
            "field": "subject",
            "terms": { 
                "guerra civil": 5
            }
        },
        {
            "field": "creator",
            "terms": { 
                "autor desconocido": 5,
                "shawn robertson": 2
            }
        },
        {
            "field": "format",
            "terms": { 
                "audio/mp3": 131,
                "jpg": 7
            }
        }
        
    ]
}