/**
     * Generate the access token.
     * @return The access token.
     */
    public String generateAccessToken() {
        return RandomStringUtils.random(ComponentUtil.getFessConfig().getApiAccessTokenLengthAsInteger(), 0, 0, true, true, null, random);
    }

    /**
     * Get the access token from the request.
     * @param request The request.
     * @return The access token.
     */

     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     * @throws NumberFormatException When the property is not integer.
     */
    Integer getApiAccessTokenLengthAsInteger();

    /**
     * Get the value for the key 'api.access.token.required'. <br>
     * The value is, e.g. false <br>
     * comment: Whether API access token is required.