* @return An empty map.
     */
    protected Map<String, Object> createEmptyMap() {
        final Map<String, Object> map = new HashMap<>();
        map.put(FieldNames.TEXT, StringUtil.EMPTY);

        for (int i = 0; i < readings.length; i++) {
            map.put(FieldNames.READING_PREFIX + i, new String[] {});
        }

        map.put(FieldNames.FIELDS, new String[] {});
        map.put(FieldNames.TAGS, new String[] {});

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

public class KuromojiKatakanaStemmerFactory extends AbstractTokenFilterFactory {

    private final int minimumLength;

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

 */
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) {

            final long requestInterval) {
        final Deferred<SuggestIndexResponse> deferred = new Deferred<>();
        threadPool.execute(() -> {
            final long start = System.currentTimeMillis();
            int numberOfSuggestDocs = 0;
            int numberOfInputDocs = 0;
            final List<Throwable> errors = new ArrayList<>();

    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();
    }

    /**

import java.nio.file.Path;

import org.apache.lucene.analysis.TokenStream;
import org.codelibs.analysis.en.ReloadableKeywordMarkerFilter;
import org.opensearch.common.settings.Settings;
import org.opensearch.common.unit.TimeValue;
import org.opensearch.env.Environment;
import org.opensearch.index.IndexSettings;
import org.opensearch.index.analysis.AbstractTokenFilterFactory;

import java.nio.file.Path;

import org.apache.lucene.analysis.TokenStream;
import org.codelibs.analysis.en.ReloadableStopFilter;
import org.opensearch.common.settings.Settings;
import org.opensearch.common.unit.TimeValue;
import org.opensearch.env.Environment;
import org.opensearch.index.IndexSettings;
import org.opensearch.index.analysis.AbstractTokenFilterFactory;