}

    /**
     * Reads and processes index settings from configuration file.
     *
     * @param fesenType          the search engine type
     * @param indexConfigFile    the path to the index configuration file
     * @param numberOfShards     the number of primary shards
     * @param autoExpandReplicas the auto expand replicas setting
     * @return the processed index settings JSON
     */

    /** The key of the message: The data already exists. Please try again. */
    public static final String ERRORS_APP_DB_ALREADY_EXISTS = "{errors.app.db.already.exists}";

    /** The key of the message: It may have been processed before this request. Please try again. */
    public static final String ERRORS_APP_DOUBLE_SUBMIT_REQUEST = "{errors.app.double.submit.request}";

    /** The key of the message: Invalid username or password. */