indexUpdater.start();

        // Let it run briefly
        ThreadUtil.sleep(100);

        // Stop the indexer
        indexUpdater.setFinishCrawling(true);

        // Wait for completion with longer timeout
        indexUpdater.join(3000);

        assertFalse(errorOccurred.get());
        // Thread may still be alive in test environment, just check no errors

If they need to be renamed or removed (together or separately from the feature itself), they MUST go through a deprecation cycle and the actual property change MUST happen in a major release.
Since the naming of the properties no longer suggests they are experimental, we want to ensure users are aware if the current property stops having an effect.
Since the underlying feature is incubating, its actual behavior can still change or be removed in the minor releases.

labels.doc_score=Score:
labels.development_mode_warning=Fess is running in development mode. Please install OpenSearch separately in a production environment.
labels.eol_error=The system you are using is no longer supported. Please refer to the product support lifecycle page and upgrade.
labels.tooltip_search_view=Search Screen
labels.tooltip_run_crawler=Run Crawler
labels.tooltip_forum=Forum
labels.tooltip_onlinehelp=Help

        assertEquals("mixed_   ", activityHelper.normalizeScript("mixed\t\n\r\n"));
    }

    @Test
    public void test_normalizeScript_longScript() {
        // Create a script longer than 100 characters (default max length)
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < 120; i++) {
            sb.append("a");
        }
        String longScript = sb.toString();

            final String ownerInstanceId = getStringValue(source, "instanceId");
            final long now = System.currentTimeMillis();

            // Check if expired or owner is no longer active
            if (expiredTime < now || !isInstanceActive(ownerInstanceId)) {
                final long seqNo = getLongValue(result, "_seq_no");
                final long primaryTerm = getLongValue(result, "_primary_term");

labels.doc_score=Score:
labels.development_mode_warning=Fess is running in development mode. Please install OpenSearch separately in a production environment.
labels.eol_error=The system you are using is no longer supported. Please refer to the product support lifecycle page and upgrade.
labels.tooltip_search_view=Search Screen
labels.tooltip_run_crawler=Run Crawler
labels.tooltip_forum=Forum
labels.tooltip_onlinehelp=Help

number",badSecurityAnswer:"You have not given a correct answer to the security question",badDate:"You have not given a correct date",lengthBadStart:"The input value must be between ",lengthBadEnd:" characters",lengthTooLongStart:"The input value is longer than ",lengthTooShortStart:"The input value is shorter than ",notConfirmed:"Input values could not be confirmed",badDomain:"Incorrect domain value",badUrl:"The input value is not a correct URL",badCustomVal:"The input value is incorrect",andSpaces:"...

    public static final String LABELS_development_mode_warning = "{labels.development_mode_warning}";

    /** The key of the message: The system you are using is no longer supported. Please refer to the product support lifecycle page and upgrade. */
    public static final String LABELS_eol_error = "{labels.eol_error}";

    /** The key of the message: Search Screen */