public List<RankProperty> getRankProperties() {
        List<RankProperty> properties = new ArrayList<>();
        for (List<RankProperty> propertyList : getRankPropertyMap().values()) {
            properties.addAll(propertyList);
        }
        return Collections.unmodifiableList(properties);
    }
Returns a read only flattened list view of the rank properties to use in this profile. This is never null.
config-model/src/main/java/com/yahoo/schema/RankProfile.java