}
        mergedItem.roles = roleList.toArray(new String[roleList.size()]);

        mergedItem.kinds = concatKinds(item1.kinds, item2.kinds);
        mergedItem.timestamp = item2.timestamp;
        mergedItem.queryFreq = item1.queryFreq + item2.queryFreq;
        mergedItem.docFreq = item1.docFreq + item2.docFreq;
        mergedItem.userBoost = item2.userBoost;
        mergedItem.emptySource = item2.emptySource;