assertEquals(1, events.size());
        assertEquals("listener1", events.get(0));

        // Switch to listener2
        factory.setOnDestroyListener(listener2);
        assertEquals(listener2, factory.getOnDestroyListener());
        factory.destroyObject(pooledObject);
        assertEquals(2, events.size());
        assertEquals("listener2", events.get(1));

        // Clear listener

import org.codelibs.fess.crawler.log.LogType;

/**
 * Implementation of the {@link LogHelper} interface.
 * This class provides methods for logging various events during the crawling process.
 * It uses Log4j2 for logging.
 *
 * <p>
 * The class contains methods for logging different types of events, such as:
 * </p>
 * <ul>
 *   <li>Starting and finishing threads</li>
 *   <li>Starting and cleaning up crawling</li>

     */
    protected Client client;

    /**
     * The address of the OpenSearch instance.
     */
    protected String address;

    /**
     * List of listeners for connection events.
     */
    protected List<OnConnectListener> onConnectListenerList = new ArrayList<>();

    /**
     * Flag indicating whether the client is connected.
     */
    private volatile boolean connected;

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