protected Map<String, QueueHolder> sessionCache = new ConcurrentHashMap<>();

    /**
     * The number of URLs to fetch when polling.
     */
    protected int pollingFetchSize = 1000;

    /**
     * The maximum size of the crawling queue.
     */
    protected int maxCrawlingQueueSize = 100;

    /**
     * Creates a new instance of OpenSearchUrlQueueService.
     * @param crawlerConfig The crawler configuration.
     */

 */
public interface ReadingConverter {

    /**
     * Returns the maximum number of readings.
     *
     * @return the maximum number of readings, default is 10.
     */
    default int getMaxReadingNum() {
        return 10;
    }

    /**
     * Initializes the converter.
     *
     * @throws IOException if an I/O error occurs during initialization.
     */

        } else {
            stopwords = new String[0];
        }

        ignoreCase = settings.getAsBoolean("ignore_case", Boolean.FALSE).booleanValue();
        if (ignoreCase) {
            for (int i = 0; i < stopwords.length; i++) {
                stopwords[i] = stopwords[i].toLowerCase(Locale.ROOT);
            }
        }
    }

    @Override
    public TokenStream create(final TokenStream tokenStream) {

        } else {
            stopwords = new String[0];
        }

        ignoreCase = settings.getAsBoolean("ignore_case", Boolean.FALSE).booleanValue();
        if (ignoreCase) {
            for (int i = 0; i < stopwords.length; i++) {
                stopwords[i] = stopwords[i].toLowerCase(Locale.ROOT);
            }
        }
    }

    @Override
    public TokenStream create(final TokenStream tokenStream) {

    protected Normalizer normalizer;
    /** The analyzer. */
    protected SuggestAnalyzer analyzer;
    /** The thread pool. */
    protected ExecutorService threadPool;

    /** The thread pool size. */
    protected int threadPoolSize = Runtime.getRuntime().availableProcessors();

    /**
     * Sets the suggest settings.
     * @param settings The suggest settings.
     * @return This builder instance.
     */

     */
    @Override
    public void addClient(final String regex, final CrawlerClient client, final int pos) {
        factory.addClient(regex, client, pos);
    }

    /**
     * Returns the hash code of the wrapped factory.
     * @return The hash code.
     */
    @Override
    public int hashCode() {
        return factory.hashCode();
    }

    /**

    private static final String NBEST_EXAMPLES = "nbest_examples";

    private final UserDictionary userDictionary;
    private final Mode mode;
    private final String nBestExamples;
    private final int nBestCost;

    private boolean discartPunctuation;

    public KuromojiTokenizerFactory(IndexSettings indexSettings, Environment env, String name, Settings settings) {
        super(indexSettings, settings, name);

                if (hits.length == 0) {
                    break;
                }
                for (final SearchHit hit : hits) {
                    final Map<String, Object> source = hit.getSourceAsMap();
                    final String fieldReadingAnalyzer = source.get(FieldNames.ANALYZER_SETTINGS_READING_ANALYZER) == null ? null

import org.opensearch.index.IndexSettings;
import org.opensearch.index.analysis.AbstractTokenFilterFactory;

public class AlphaNumWordFilterFactory extends AbstractTokenFilterFactory {

    private final int maxTokenLength;

    public AlphaNumWordFilterFactory(final IndexSettings indexSettings, final Environment environment, final String name,
            final Settings settings) {
        super(indexSettings, name, settings);

            final String[] strings = name.split("\\.");
            final StringBuilder buf = new StringBuilder(100);
            if (strings.length > 1) {
                for (int i = 0; i < strings.length - 1; i++) {
                    if (buf.length() != 0) {
                        buf.append('.');
                    }
                    buf.append(strings[i]);
                }