/** The parse field for the active features. */
    public static final ParseField ACTIVE_FEATURES = new ParseField("active_features");
    private static final ObjectParser<StoredLtrQueryBuilder, Void> PARSER;

    static {
        PARSER = new ObjectParser<>(NAME);
        PARSER.declareString(StoredLtrQueryBuilder::modelName, MODEL_NAME);
        PARSER.declareString(StoredLtrQueryBuilder::featureSetName, FEATURESET_NAME);