* Rank fusion searchers are responsible for executing search queries and
 * can be combined to implement advanced ranking strategies.
 */
public abstract class RankFusionSearcher {
    /** The name of this searcher, lazily initialized. */
    protected String name;

    /**
     * Default constructor for creating a new rank fusion searcher instance.

     * If no specific searchers are configured, returns all searchers.
     *
     * @return array of available RankFusionSearcher instances
     */
    protected RankFusionSearcher[] getAvailableSearchers() {
        if (availableSearcherNameSet.isEmpty()) {
            return searchers;
        }
        final RankFusionSearcher[] availableSearchers = Arrays.stream(searchers)

                return new String[0];
            }
        };
    }

    private RankFusionSearcher rankFusionSearcher;

    @Override
    public void setUp() throws Exception {
        super.setUp();
        // Create a concrete implementation for testing
        rankFusionSearcher = new TestRankFusionSearcher();
    }

    public void test_getName_defaultBehavior() {

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);

                assertEquals(0, list.getStart());
            } else {
                fail();
            }
        }
    }

    static class TestMainSearcher extends RankFusionSearcher {

        private long allRecordCount;

        TestMainSearcher(int allRecordCount) {
            this.allRecordCount = allRecordCount;
        }

        @Override