/** Empty user ID placeholder. */
    public static final String EMPTY_USER_ID = "<empty>";

    /** Crawler process command for thread dump. */
    public static final String CRAWLER_PROCESS_COMMAND_THREAD_DUMP = "thread_dump";

    // ============================================================
    // Path and Configuration Constants
    // ============================================================

		instance="prototype">
		<!--
		<property name="maxDocumentCacheSize">5</property>
		<property name="unprocessedDocumentSize">100</property>
		<property name="threadDump">false</property>
		<postConstruct name="addBoostDocumentRule">
			<arg>
				<component class="org.codelibs.fess.indexer.BoostDocumentRule">
					<property name="matchExpression">"url.matches(\".*fess.*\")"</property>

                                    </c:if>
                                    <c:if test="${running}">
                                        <button type="submit" class="btn btn-warning" name="threaddump"
                                                value="<la:message key="labels.crawling_info_thread_dump" />">
                                            <em class="fa fa-bolt">

    }

    /**
     * Print a thread dump.
     * @param form The edit form.
     * @return The HTML response.
     */
    @Execute
    @Secured({ ROLE })
    public HtmlResponse threaddump(final EditForm form) {
        verifyCrudMode(form.crudMode, CrudMode.DETAILS);
        validate(form, messages -> {}, this::asDetailsHtml);
        verifyToken(this::asDetailsHtml);
        final String id = form.id;