@Override
    public boolean equals(Object o) {
        if (o == this) return true;
        if( ! (o instanceof Sorting ss)) return false;
        return fieldOrders.equals(ss.fieldOrders);
    }
Returns the field orders of this sort specification as list. This is never null but can be empty.
This list can be modified to change this sort spec.
container-search/src/main/java/com/yahoo/search/query/Sorting.java