[{
    $addFields: {
        isFound: {
            $function: {
                body: function(name) {
                    return hex_md5(name) == "15b0a220baa16331e8d80e15367677ad";
                },
                args: ["$name"],
                lang: "js"
            }
        },
        message: {
            $function: {
                body: function(name, scores) {
                    let total = Array.sum(scores);
                    return `Hello ${name}.  Your total score is ${total}.`;
                },
                args: ["$name", "$scores"],
                lang: "js"
            }
        }
    }
}]