*
     * @return array of available RankFusionSearcher instances
     */
    protected RankFusionSearcher[] getAvailableSearchers() {
        if (searchers.isEmpty()) {
            logger.warn("No searchers registered");
            return new RankFusionSearcher[0];
        }
        if (availableSearcherNameSet.isEmpty()) {
            return searchers.toArray(new RankFusionSearcher[0]);
        }

import org.opensearch.search.fetch.subphase.highlight.HighlightField;

/**
 * Default implementation of RankFusionSearcher that performs standard OpenSearch queries.
 * This searcher handles query execution, response processing, and document highlighting.
 */
public class DefaultSearcher extends RankFusionSearcher {

    /** Logger for this class. */
    private static final Logger logger = LogManager.getLogger(DefaultSearcher.class);