/**
 * OpenSearchDataService is an implementation of {@link DataService} for OpenSearch.
 */
public class OpenSearchDataService extends AbstractCrawlerService implements DataService<OpenSearchAccessResult> {

    /**
     * Creates a new instance of OpenSearchDataService.
     * @param crawlerConfig The crawler configuration.
     */
    public OpenSearchDataService(final OpenSearchCrawlerConfig crawlerConfig) {

     * @return The access result data.
     */
    @Override
    public AccessResultData<String> getAccessResultData() {
        if (!initializedData) {
            final OpenSearchDataService dataService = SingletonLaContainer.getComponent(OpenSearchDataService.class);
            final OpenSearchAccessResult accessResult = dataService.getAccessResult(getSessionId(), getUrl());

        final OpenSearchUrlQueueService urlQueueService = ComponentUtil.getComponent(OpenSearchUrlQueueService.class);
        final OpenSearchDataService dataService = ComponentUtil.getComponent(OpenSearchDataService.class);

        try {
            // clear url filter
            urlFilterService.delete(sid);
        } catch (final Exception e) {

// Delete session data
dataService.delete(sessionId);
```

### OpenSearch Integration

```java
// Add OpenSearch dependency and configure
container.singleton("opensearchDataService", OpenSearchDataService.class, service -> {
    service.setIndexName("crawler-data");
    service.setHostname("localhost");
    service.setPort(9200);
});
```

## Performance Tuning

import org.codelibs.fess.crawler.service.DataService;
import org.codelibs.fess.crawler.service.UrlFilterService;
import org.codelibs.fess.crawler.service.UrlQueueService;
import org.codelibs.fess.crawler.service.impl.OpenSearchDataService;
import org.codelibs.fess.crawler.transformer.Transformer;
import org.codelibs.fess.crawler.util.OpenSearchResultList;
import org.codelibs.fess.exception.ContainerNotAvailableException;

import org.codelibs.fess.crawler.service.DataService;
import org.codelibs.fess.crawler.service.UrlFilterService;
import org.codelibs.fess.crawler.service.UrlQueueService;
import org.codelibs.fess.crawler.service.impl.OpenSearchDataService;
import org.codelibs.fess.crawler.transformer.Transformer;
import org.codelibs.fess.crawler.util.OpenSearchResultList;
import org.codelibs.fess.exception.ContainerNotAvailableException;

     */
    private static final Logger logger = LogManager.getLogger(OpenSearchUrlQueueService.class);

    /**
     * Data service for checking access results.
     */
    @Resource
    protected OpenSearchDataService dataService;

    /**
     * Cache for session queues.
     */
    protected Map<String, QueueHolder> sessionCache = new ConcurrentHashMap<>();

    /**
     * The number of URLs to fetch when polling.