private static final long serialVersionUID = 1L;

    /** Default number of records to display per page. */
    public static final int DEFAULT_PAGE_SIZE = 20;

    /** Default current page number when pagination starts. */
    public static final int DEFAULT_CURRENT_PAGE_NUMBER = 1;

    /** Total number of records available across all pages. */
    private int allRecordCount;

    /** Total number of pages available for pagination. */

        pollTask = TimeoutManager.getInstance().addTimeoutTarget(this::poll, interval, true);

        if (logger.isInfoEnabled()) {
            logger.info("CoordinatorHelper started: instanceId={}", instanceId);
        }
    }

    /**
     * Stops the poll loop and removes the heartbeat document on shutdown.
     */
    @PreDestroy
    public void destroy() {

            return null;
        }
        int start = entryDn.toLowerCase(Locale.ROOT).indexOf("cn=");
        if (start == -1) {
            return null;
        }
        start += 3;

        final int end = entryDn.indexOf(',', start);
        final String value = end == -1 ? entryDn.substring(start) : entryDn.substring(start, end);
        if (fessConfig.isLdapGroupNameWithUnderscores()) {

            assertEquals("2001:db8::1", method.invoke(null, "2001:0db8:0:0:0:0:0:1"));

            // Longest sequence of zeros compressed (3 zeros at end vs 1 zero at start)
            assertEquals("2001:db8:0:1::1", method.invoke(null, "2001:0db8:0:1:0:0:0:1"));

            // No compression when all segments are non-zero (just remove leading zeros)

            }
        });

    }

    /**
     * Begins statistics tracking for the specified crawler object.
     * Creates a new statistics object in the cache and starts timing.
     *
     * @param keyObj the crawler object to track (UrlQueue, StatsKeyObject, String, or Number)
     */
    public void begin(final Object keyObj) {
        getCacheKey(keyObj).ifPresent(key -> {

                    } catch (Exception e) {
                        // Log error
                    }
                }
            });
            threads.add(thread);
            thread.start();
        }

        // Wait for all threads
        for (Thread thread : threads) {
            thread.join();
        }

        // Verify all documents were processed

                } catch (final IOException e) {
                    logger.debug("I/O exception while reading process command.", e);
                }
            }, "ProcessCommand");
            commandThread.start();

            systemMonitorTask = TimeoutManager.getInstance()
                    .addTimeoutTarget(new SystemMonitorTarget(), ComponentUtil.getFessConfig().getCrawlerSystemMonitorIntervalAsInteger(),

                                    </c:if>
                                    <c:if test="${!running && enabled}">
                                        <button type="submit" class="btn btn-success" name="start"
                                                value="<la:message key="labels.scheduledjob_button_start" />">
                                            <i class="fa fa-play-circle" aria-hidden="true"></i>

         */
        public JvmClassesObj() {
            // Default constructor
        }

        /** Currently loaded classes */
        public long loaded;
        /** Total classes loaded since JVM start */
        public long total_loaded;
        /** Total classes unloaded */
        public long unloaded;
    }

    /**
     * Data transfer object representing process statistics.
     */

    public void addFilter(final Filter filter) {
        filterList.add(filter);
        createFilterChain();
    }

    /**
     * Creates the filter chain by combining all registered filters.
     * The chain starts with the default filter chain and appends each registered filter.
     */
    protected void createFilterChain() {
        FilterChain chain = createDefaultFilterChain();
        for (final Filter element : filterList) {