* Provides document indexing, searching, and administrative operations.
 */
public class SearchEngineClient implements Client {

    /**
     * Default constructor.
     */
    public SearchEngineClient() {
        // Default constructor
    }

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

    private static final String DOC_INDEX = "fess";

    }

    // Test normal operation with GREEN status and state change
    @Test
    public void test_execute_greenStatusNoChange() {
        // Setup mock components
        SearchEngineClient searchEngineClient = new SearchEngineClient() {
            @Override
            public PingResponse ping() {
                return new PingResponse(createMockHealthResponse("test-cluster", ClusterHealthStatus.GREEN));
            }

            @Override
            protected long getDocumentSizeByQuery(final SearchEngineClient searchEngineClient, final QueryBuilder queryBuilder,
                    final FessConfig fessConfig) {
                return documentSizeByQuery;
            }

            @Override
            protected int refreshIndex(final SearchEngineClient searchEngineClient, final String index) {
                return 200;
            }
        };

    private IntervalControlHelper intervalControlHelper;
    private SearchLogHelper searchLogHelper;
    private LanguageHelper languageHelper;
    private FessConfig fessConfig;
    private SearchEngineClient searchEngineClient;
    private DataService<OpenSearchAccessResult> dataService;
    private UrlQueueService<OpenSearchUrlQueue> urlQueueService;
    private UrlFilterService urlFilterService;
    private ClickLogBhv clickLogBhv;

        // Note: In a real test environment, this would require proper SearchEngineClient setup
        // For now, we test that the method signature is correct and can be called

        AtomicInteger callbackCount = new AtomicInteger(0);

        try {
            // This will likely fail due to missing SearchEngineClient setup,
            // but we can verify the method signature and basic functionality

     *
     * @return a string containing the execution result or error messages
     */
    public String execute() {
        final SearchEngineClient searchEngineClient = ComponentUtil.getSearchEngineClient();
        final FessConfig fessConfig = ComponentUtil.getFessConfig();

        final StringBuilder resultBuf = new StringBuilder();

    }

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

    /** The search engine client for interacting with OpenSearch. */
    @Resource
    public SearchEngineClient searchEngineClient;

    /**
     * A nested class for parsing command-line options.
     */
    protected static class Options {
        /** The session ID for the suggest creation process. */

    // Attribute
    // =========

    /** Client for interacting with the search engine. */
    @Resource
    protected SearchEngineClient searchEngineClient;

    /** Helper for building and parsing search queries. */
    @Resource
    protected QueryHelper queryHelper;

    /** Helper for executing search operations. */
    @Resource

        }
        try {
            searchEngineClient.flushConfigFiles(() -> {
                final String docIndex = fessConfig.getIndexDocumentUpdateIndex();
                searchEngineClient.admin().indices().prepareClose(docIndex).execute(ActionListener.wrap(res -> {
                    logger.info("Closing index: {}", docIndex);

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

    /**
     * OpenSearch client for accessing indexed documents.
     */
    @Resource
    public SearchEngineClient searchEngineClient;

    /**
     * Default constructor for ThumbnailGenerator.
     */
    public ThumbnailGenerator() {
        // Default constructor
    }

    /**