* It implements rank fusion techniques to combine results from different search engines
 * and provides a unified search interface.
 */
public class RankFusionProcessor implements AutoCloseable {

    private static final Logger logger = LogManager.getLogger(RankFusionProcessor.class);

    /** Array of rank fusion searchers available for processing search requests */

        }
    }

    /**
     * A holder for the directory context.
     */
    protected class DirContextHolder implements AutoCloseable {
        private final DirContext context;

        private int counter = 1;

        /**
         * Constructs a new directory context holder.
         *