public OptionalDouble getTermwiseLimit() {
        if (termwiseLimit != null) return OptionalDouble.of(termwiseLimit);
        return uniquelyInherited(RankProfile::getTermwiseLimit, OptionalDouble::isPresent, "termwise-limit")
                .orElse(OptionalDouble.empty());
    }
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