* and provides various query-based operations for document management.
 * It also integrates with the thumbnail generation system and handles
 * the cleanup of old documents during updates.</p>
 */
public class IndexingHelper {
    /** Logger for this class */
    private static final Logger logger = LogManager.getLogger(IndexingHelper.class);

    /** Maximum number of retry attempts for failed operations */

- **Switch Expressions** - Optimized implementations using switch expressions for better performance
- **Sequenced Collections** - Full support for Java 21 sequenced collections API with dedicated utility methods
- **Performance Focused** - Optimized implementations for better runtime performance with reduced memory allocation

    /** Request attribute key for screen width */
    protected static final String SCREEN_WIDTH = "screen_width";

    /** Tablet width threshold for responsive design */
    protected static final int TABLET_WIDTH = 768;

    /** HTTP header name for content disposition */
    protected static final String CONTENT_DISPOSITION = "Content-Disposition";

    /** Cache key for highlighted cache content */

 */
public class QueryContext {

    /** Prefix for queries that search only in URL fields. */
    protected static final String ALLINURL_FIELD_PREFIX = "allinurl:";

    /** Prefix for queries that search only in title fields. */
    protected static final String ALLINTITLE_FIELD_PREFIX = "allintitle:";

    /** The OpenSearch query builder used for executing the search. */
    protected QueryBuilder queryBuilder;

    /** Service for URL filtering operations */
    @Resource
    protected UrlFilterService urlFilterService;

    /** Behavior class for click log operations */
    @Resource
    protected ClickLogBhv clickLogBhv;

    /** Behavior class for favorite log operations */
    @Resource
    protected FavoriteLogBhv favoriteLogBhv;

    /** Helper for system-level operations */
    @Resource

            });
        }

        // Start all threads
        for (Thread thread : threads) {
            thread.start();
        }

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

        // Check all providers were created successfully
        for (int i = 0; i < threadCount; i++) {

/**
 * Admin action for maintenance operations including reindexing, log management,
 * and system diagnostics.
 */
public class AdminMaintenanceAction extends FessAdminAction {

    /**
     * Default constructor for AdminMaintenanceAction.
     */
    public AdminMaintenanceAction() {
        super();
    }

    /**
     * Role identifier for admin maintenance operations.
     */

/**
 * Service for managing stopwords.
 * This class provides methods to interact with stopwords dictionaries,
 * including retrieving, storing, and deleting stopwords.
 */
public class StopwordsService {
    /** The dictionary manager for accessing dictionary files. */
    @Resource
    protected DictionaryManager dictionaryManager;

    /** The Fess configuration for accessing system settings. */
    @Resource

/**
 * Service for managing synonyms.
 * This class provides methods to interact with synonym dictionaries,
 * including retrieving, storing, and deleting synonyms.
 */
public class SynonymService {
    /** The dictionary manager for accessing dictionary files. */
    @Resource
    protected DictionaryManager dictionaryManager;

    /** The Fess configuration for accessing system settings. */
    @Resource

import org.jspecify.annotations.Nullable;

/**
 * Generates a dummy interface proxy that simply returns a dummy value for each method.
 *
 * @author Ben Yu
 */
@GwtIncompatible
@J2ktIncompatible
@NullMarked
abstract class DummyProxy {

  /**
   * Returns a new proxy for {@code interfaceType}. Proxies of the same interface are equal to each