source.put("TestKey", "value1");
        source.put("AnotherTestKey", "value2");

        Map<String, Object> nested = new HashMap<>();
        nested.put("NestedKey", "nestedValue");
        source.put("NestedMap", nested);

        Map<String, Object> result = searchLogHelper.toLowerHyphen(source);

        assertEquals("value1", result.get("test_key"));

            final String key = e.getKey();
            Object value = e.getValue();
            if (value == null) {
                value = StringUtil.EMPTY;
            }
            if (value instanceof String || value == null) {
                return new Pair<>(key, value);
            }
            if (arrayFieldSet.contains(key)) {
                if (value instanceof String[]) {

                valueMap.remove("time");
                valueMap.remove("ip");
                super.printByLtsv(valueMap);
            }

            @Override
            protected void printByEcs(final Map<String, String> valueMap) {
                valueMap.put("time", "2022-01-01T00:00:00.000Z");
                valueMap.remove("ip");

        });
        log(valueMap);
    }

    /**
     * Log the value map.
     * @param valueMap The value map.
     */
    protected void log(final Map<String, String> valueMap) {
        valueMap.put("ip", getClientIp());
        valueMap.put("time", DateTimeFormatter.ISO_INSTANT.format(ZonedDateTime.now()));
        if (useEcsFormat) {
            printByEcs(valueMap);
        } else {

                    }
                    postcard.setHostname(systemHelper.getHostname());
                    postcard.setLevel(level);
                    postcard.setCount(String.valueOf(levelEvents.size()));
                    postcard.setInterval(String.valueOf(fessConfig.getLogNotificationIntervalAsInteger()));
                    postcard.setDetails(details);
                });
            } catch (final Exception e) {

        final String[] values = servletPath.replaceAll("/+", "/").split("/");
        final String value = values.length > 3 ? values[3] : null;
        if (value == null) {
            return FormatType.SEARCH;
        }
        final String type = value.toLowerCase(Locale.ROOT);
        if ("documents".equals(type)) {
            if (values.length > 5 && "favorite".equals(values[5])) {

                        .stream()
                        .forEach(e -> logger.debug("Property: {}={}", e.getKey(),
                                SystemUtil.maskSensitiveValue(String.valueOf(e.getKey()), String.valueOf(e.getValue()))));
                System.getenv()
                        .entrySet()

    /** Property key for default label value configuration. */
    public static final String DEFAULT_LABEL_VALUE_PROPERTY = "label.value";

    /** Property key for default sort value configuration. */
    public static final String DEFAULT_SORT_VALUE_PROPERTY = "sort.value";

    /** Property key for virtual host value configuration. */

        value = "ja-JP";
        assertEquals("ja", systemHelper.normalizeLang(value));

        value = "ja_JP";
        assertEquals("ja", systemHelper.normalizeLang(value));

        value = "ja_JP_AAA";
        assertEquals("ja", systemHelper.normalizeLang(value));

        value = "zh";
        assertEquals("zh", systemHelper.normalizeLang(value));

        value = "zh-cn";

     */
    @Size(max = 10)
    public String webApiJson;

    /**
     * Application-specific value for custom configurations.
     * This field can be used to store custom application settings.
     */
    @Size(max = 10000)
    public String appValue;

    /**
     * Default label value to use when no specific label is selected.
     * This affects which documents are included in search results by default.