public List<AccessResult<?>> getAccessResultList(String url, boolean hasData) {
                return null;
            }

            @Override
            public void iterate(String sessionId, AccessResultCallback<AccessResult<?>> callback) {
            }
        };

        CrawlingParameterUtil.setDataService(service);

        // Verify it can be retrieved

import org.codelibs.fess.crawler.entity.OpenSearchAccessResultData;
import org.codelibs.fess.crawler.exception.OpenSearchAccessException;
import org.codelibs.fess.crawler.service.DataService;
import org.codelibs.fess.crawler.util.AccessResultCallback;
import org.codelibs.fess.crawler.util.OpenSearchCrawlerConfig;
import org.codelibs.fess.crawler.util.OpenSearchResultList;
import org.opensearch.action.DocWriteRequest.OpType;