public static Sizes unlimited() {
        return UNLIMITED;
    }
Class for describing the maximum number of items to hold in a store at each level of grouping.
e.g. 100,10,1 means hold 100 items at group level 0, 10 for each group level 1 and 1 for
each group level 2
stroom-query/stroom-query-common/src/main/java/stroom/query/common/v2/Sizes.java