@JsonIgnore
    public Set<CustomRollUpMask> getCustomRollUpMasks() {
        if (config != null) {
            return config.getCustomRollUpMasks();
        } else {
            return Collections.emptySet();
        }
    }
@return A new builder for creating a {@link DocRef} for this document's type.
stroom-core-shared/src/main/java/stroom/statistics/impl/sql/shared/StatisticStoreDoc.java