Check that tika-server is running.  If not, download JAR file and start it up.
    :param scheme: e.g. http or https
    :param serverHost:
    :param port:
    :param tikaServerJar:
    :param classpath:
    :return:

def checkTikaServer(scheme="http", serverHost=ServerHost, port=Port, tikaServerJar=TikaServerJar, classpath=None, config_path=None):
    '''
    Check that tika-server is running.  If not, download JAR file and start it up.
    :param scheme: e.g. http or https
    :param serverHost:
    :param port:
    :param tikaServerJar:
    :param classpath:
    :return:
    '''
    if classpath is None:
        classpath = TikaServerClasspath
    if port is None:
        port = '443' if scheme == 'https' else '80'

    urlp = urlparse(tikaServerJar)
    serverEndpoint = '%s://%s:%s' % (scheme, serverHost, port)
    jarPath = os.path.join(TikaJarPath, 'tika-server.jar')
    if 'localhost' in serverEndpoint or '127.0.0.1' in serverEndpoint:
        alreadyRunning = checkPortIsOpen(serverHost, port)

        if not alreadyRunning:
            if not os.path.isfile(jarPath) and urlp.scheme != '':
                getRemoteJar(tikaServerJar, jarPath)

            if not checkJarSig(tikaServerJar, jarPath):
                os.remove(jarPath)
                tikaServerJar = getRemoteJar(tikaServerJar, jarPath)

            status = startServer(jarPath, TikaJava, serverHost, port, classpath, config_path)
            if not status:
                log.error("Failed to receive startup confirmation from startServer.")
                raise RuntimeError("Unable to start Tika server.")
    return serverEndpoint