*/
    public List<String> activeFeatures() {
        return activeFeatures;
    }

    /**
     * Sets the list of active features.
     *
     * @param activeFeatures A list of active features.
     * @return This query builder.
     */
    public StoredLtrQueryBuilder activeFeatures(final List<String> activeFeatures) {
        this.activeFeatures = Objects.requireNonNull(activeFeatures);