*
 * <p>For up-to-date Unicode character properties (digit, letter, etc.) and support for
 * supplementary code points, use ICU4J UCharacter and UnicodeSet (freeze() after building). For
 * basic text processing based on UnicodeSet use the ICU4J UnicodeSetSpanner.
 *
 * <p>Example usages:
 *
 * <pre>

        FessSystemException cause = null;
        for (int i = 0; i < maxConfigSyncStatusRetry; i++) {
            try (CurlResponse response = ComponentUtil.getCurlHelper().get("/_configsync/wait").param("status", "green").execute()) {
                final int httpStatusCode = response.getHttpStatusCode();
                if (httpStatusCode == 200) {
                    logger.info("ConfigSync is ready.");
                    return;

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 *
 * <p>For up-to-date Unicode character properties (digit, letter, etc.) and support for
 * supplementary code points, use ICU4J UCharacter and UnicodeSet (freeze() after building). For
 * basic text processing based on UnicodeSet use the ICU4J UnicodeSetSpanner.
 *
 * <p>Example usages:
 *
 * <pre>