@Override
        public UcaSorter clone() {
            UcaSorter clone = (UcaSorter)super.clone();
            if (locale != null) {
                clone.setLocale(locale, strength);
            }
            return clone;
        }
Returns the serial form of this which contains all information needed to reconstruct this sorter
container-search/src/main/java/com/yahoo/search/query/Sorting.java