* written to log files or stored in the search index. Implementations include
 * search logs, click logs, favorite logs, and user information logs.
 */
public interface SearchLogEvent {
    /**
     * Gets the unique identifier for this search log event.
     *
     * @return The event ID
     */
    String getId();

    /**
     * Gets the version number for this search log event.

        // Create different implementations
        SearchLogEvent event1 = new TestSearchLogEvent("id1", 1L, "type1");
        SearchLogEvent event2 = new NullSearchLogEvent();
        SearchLogEvent event3 = new EmptySearchLogEvent();

        // Test polymorphic behavior
        SearchLogEvent[] events = { event1, event2, event3 };

        for (SearchLogEvent event : events) {

import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Map;

import org.codelibs.fess.entity.SearchLogEvent;
import org.codelibs.fess.opensearch.log.bsentity.BsFavoriteLog;

/**
 * @author FreeGen
 */
public class FavoriteLog extends BsFavoriteLog implements SearchLogEvent {

    private static final long serialVersionUID = 1L;

    private Map<String, Object> fields;

    @Override

    *
    * @param searchLogEvent The search log event.
    * @return The source map.
    */
    protected Map<String, Object> toSource(final SearchLogEvent searchLogEvent) {
        final Map<String, Object> source = toLowerHyphen(searchLogEvent.toSource());
        source.put("_id", searchLogEvent.getId());
        // source.put("version_no", searchLogEvent.getVersionNo());

import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Map;

import org.codelibs.fess.entity.SearchLogEvent;
import org.codelibs.fess.opensearch.log.bsentity.BsUserInfo;

/**
 * @author FreeGen
 */
public class UserInfo extends BsUserInfo implements SearchLogEvent {

    private static final long serialVersionUID = 1L;

    private Map<String, Object> fields;

    @Override

import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Map;

import org.codelibs.fess.entity.SearchLogEvent;
import org.codelibs.fess.opensearch.log.bsentity.BsClickLog;

/**
 * @author FreeGen
 */
public class ClickLog extends BsClickLog implements SearchLogEvent {

    private static final long serialVersionUID = 1L;

    private Map<String, Object> fields;

    @Override

import org.codelibs.fess.Constants;
import org.codelibs.fess.entity.SearchLogEvent;
import org.codelibs.fess.opensearch.log.bsentity.BsSearchLog;
import org.codelibs.fess.opensearch.log.exbhv.UserInfoBhv;
import org.codelibs.fess.util.ComponentUtil;
import org.dbflute.optional.OptionalEntity;

/**
 * @author FreeGen
 */
public class SearchLog extends BsSearchLog implements SearchLogEvent {

    private static final long serialVersionUID = 1L;