// Test favorite event type
        TestSearchLogEvent favoriteEvent = new TestSearchLogEvent("id", 1L, "favorite");
        assertEquals("favorite", favoriteEvent.getEventType());

        // Test user_info event type
        TestSearchLogEvent userInfoEvent = new TestSearchLogEvent("id", 1L, "user_info");
        assertEquals("user_info", userInfoEvent.getEventType());

     */
    Map<String, Object> toSource();

    /**
     * Gets the type of this search log event.
     *
     * @return The event type (e.g., "search", "click", "favorite", "user_info")
     */
    String getEventType();

        source.put("_id", searchLogEvent.getId());
        // source.put("version_no", searchLogEvent.getVersionNo());
        source.put("event_type", searchLogEvent.getEventType());
        return source;
    }

    /**
     * Converts a map to lower hyphen case.
     *
     * @param source The source map.
     * @return The converted map.
     */