Update query for random artwork

[nikhiltri]

We recently sent this same query with some minor tweaks to another developer. Make the same changes to the query in this app:

    let timeStamp = Math.floor(Date.now() / 1000);
    let artworkRequest = {
        "resources": "artworks",
        "fields": [
            "id",
            "title",
            "artist_display",
            "image_id",
            "date_display"
        ],
        "boost": false,
        "limit": 1,
        "query": {
            "function_score": {
                "query": {
                    "constant_score" : {
                        "filter": {
                            "exists": {
                                "field": "image_id"
                            }
                        }
                    }
                },
                "boost_mode": "replace",
                "random_score": {
                    "field": "id",
                    "seed": timeStamp
                }
            }
        }
    };