public Boolean getWeakandAllowDropAll() {
        if (weakandAllowDropAll != null) {
            return weakandAllowDropAll;
        }
        return uniquelyInherited(RankProfile::getWeakandAllowDropAll, "weakand-allow-drop-all").orElse(null);
    }
Returns a read only map view of the rank properties to use in this profile. This is never null.
config-model/src/main/java/com/yahoo/schema/RankProfile.java