private static final long serialVersionUID = 1L;

    /** The rule ID. */
    protected String ruleId;

    /** The response processor. */
    protected ResponseProcessor responseProcessor;

    /** The crawler container. */
    @Resource
    protected transient CrawlerContainer crawlerContainer;

    /**
     * Constructs a new AbstractRule.
     */
    public AbstractRule() {

    /** The resource name for the MIME types configuration file. */
    protected static final String MIME_TYPES_RESOURCE_NAME = "/org/codelibs/fess/crawler/mime/tika-mimetypes.xml";

    /** The MimeTypes instance for detecting MIME types. */
    protected MimeTypes mimeTypes;

    /** Whether to use the filename for MIME type detection. */
    protected boolean useFilename = false;

 */
public class EncodingHelper {

    /** The default encoding to use when no mapping is found */
    protected String defaultEncoding;

    /** Map of encoding names to their preferred forms */
    protected Map<String, String> encodingMap = new HashMap<>();

    /**
     * Constructs a new EncodingHelper.
     */
    public EncodingHelper() {

 * @param <Res> the type of the response
 */
public abstract class RequestBuilder<Req extends Request<Res>, Res extends Response> {
    /** The OpenSearch client. */
    protected Client client;
    /** The request being built. */
    protected Req request;

    /**
     * Constructor for RequestBuilder.
     * @param client The OpenSearch client.
     * @param request The request instance.
     */

    /** The OpenSearch client. */
    protected final Client client;
    /** The suggest settings. */
    protected final SuggestSettings suggestSettings;
    /** The reading converter. */
    protected final ReadingConverter readingConverter;
    /** The contents reading converter. */
    protected final ReadingConverter contentsReadingConverter;
    /** The normalizer. */
    protected final Normalizer normalizer;

                deferred.reject(e);
            }
        });
    }

    @Override
    protected String getValidationError() {
        return null;
    }

    /**
     * Builds the OpenSearch query for popular words.
     * @return The QueryBuilder instance.
     */
    protected QueryBuilder buildQuery() {
        final BoolQueryBuilder queryBuilder = QueryBuilders.boolQuery();

    /**
     * Connection timeout in milliseconds.
     */
    protected long connTimeout = 180 * 1000L;

    /**
     * Search preference.
     */
    protected String searchPreference;

    /**
     * Target indices.
     */
    protected String[] targetIndices;

    /**
     * Creates a new instance of FesenClient.

    /** Array settings for elevate words. */
    protected ArraySettings arraySettings;

    /**
     * Constructor.
     * @param settings Suggest settings
     * @param client OpenSearch client
     * @param settingsIndexName Settings index name
     * @param settingsId Settings ID
     */

    /**
     * Queue index name.
     */
    protected String queueIndex = ".crawler.queue";

    /**
     * Data index name.
     */
    protected String dataIndex = ".crawler.data";

    /**
     * Filter index name.
     */
    protected String filterIndex = ".crawler.filter";

    /**
     * Number of shards for the queue index.
     */

 * It extends the RuntimeException class and provides constructors for creating exceptions with a message, a cause, or both.
 * It also provides a protected constructor that allows to specify whether or not suppression is enabled or stack trace is writable.
 */
public class CrawlerSystemException extends RuntimeException {

    private static final long serialVersionUID = 1L;