*
     * @return true if the CPU load is within the acceptable range, false otherwise.
     */
    public boolean calibrateCpuLoad() {
        return calibrateCpuLoad(0L);
    }

    /**
     * Calibrates the CPU load with a timeout.
     *
     * @param timeoutInMillis The timeout in milliseconds.
     * @return true if the CPU load is within the acceptable range, false otherwise.
     */

    public static final Pattern LUCENE_FIELD_RESERVED_PATTERN = Pattern.compile("([+\\-!\\(\\){}\\[\\]^\"~\\\\:\\p{Zs}]|(&&)|(\\|\\|))"); // "*", "?",

    /** Pattern for detecting reserved characters in Lucene range field queries. */
    public static final Pattern LUCENE_RANGE_FIELD_RESERVED_PATTERN = Pattern.compile("([!\\(\\){}\\[\\]\"~\\\\:\\p{Zs}]|(&&)|(\\|\\|))");

    // ============================================================

    /**
     * Get the value for the key 'paging.page.range.size'. <br>
     * The value is, e.g. 5 <br>
     * comment: The size of page range for paging
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getPagingPageRangeSize();

    /**
     * Get the value for the key 'paging.page.range.size' as {@link Integer}. <br>
     * The value is, e.g. 5 <br>