* The value is, e.g. http://localhost:9201 <br>
     * comment: <br>
     * The URL of the search engine HTTP endpoint.<br>
     * For IPv6 environments, use brackets around the IPv6 address (e.g., http://[::1]:9201)
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getSearchEngineHttpUrl();

    /**