public void test_storeSearchParameters_withRequiredKeys() {
        ComponentUtil.setFessConfig(new MockFessConfig() {
            @Override
            public String getCookieSearchParameterRequiredKeys() {
                return "q";
            }
        });

        getMockRequest().setParameter("q", "test query");
        getMockRequest().setParameter("lang", "en");

        LaRequestUtil.getOptionalRequest().ifPresent(req -> {
            final FessConfig fessConfig = ComponentUtil.getFessConfig();
            final String requiredKeysStr = fessConfig.getCookieSearchParameterRequiredKeys();
            if (StringUtil.isNotBlank(requiredKeysStr) && StreamUtil.split(requiredKeysStr, ",")
                    .get(stream -> stream.map(String::trim).filter(StringUtil::isNotEmpty).anyMatch(name -> {

     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getCookieSearchParameterRequiredKeys();

    /**
     * Get the value for the key 'cookie.search.parameter.max.length'. <br>
     * The value is, e.g. 1000 <br>