private static void usage(Options options) {
        HelpFormatter helpFormatter = new HelpFormatter();
        helpFormatter.printHelp("tikaserver", options);
        System.exit(-1);
    }
This value is set to the server's id in the forked process.
tika-server/tika-server-core/src/main/java/org/apache/tika/server/core/TikaServerCli.java