/**
 * Helper for inter-instance coordination via OpenSearch.
 * Provides heartbeat registration, distributed operation locking, and event notification
 * to prevent concurrent execution of maintenance operations across multiple Fess instances.
 */
public class CoordinatorHelper {

    private static final Logger logger = LogManager.getLogger(CoordinatorHelper.class);

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.TestInfo;

/**
 * Tests for ChatClient's extractHistory and buildAssistantHistoryContent methods.
 * Verifies correct behavior across all assistant content modes (full, source_titles,
 * source_titles_and_urls, truncated, none).
 */
public class ChatClientTest extends UnitFessTestCase {

    private TestableChatClient chatClient;

    @Override

        }
        return "Unknown";
    }

    /**
     * Gets the instance ID for this Fess instance.
     * Combines scheduler.target.name (if configured), hostname, and PID
     * to ensure uniqueness across multiple JVMs on the same host.
     *
     * @return The instance ID.
     */
    public String getInstanceId() {
        final String targetName = ComponentUtil.getFessConfig().getSchedulerTargetName();

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