}
        }

        item.id = SuggestUtil.createSuggestTextId(item.text);
        item.timestamp = ZonedDateTime.ofInstant(Instant.ofEpochMilli(timestamp), Clock.systemDefaultZone().getZone());
        return item;
    }

    /**
     * Returns the updated source map by merging with existing source.
     * @param existingSource The existing source map.