public int getKeepRankCount() {
        if (keepRankCount >= 0) return keepRankCount;
        return uniquelyInherited(RankProfile::getKeepRankCount, c -> c >= 0, "keep-rank-count").orElse(-1);
    }
Whether we should ignore the default rank features. Set to null to use inherited
config-model/src/main/java/com/yahoo/schema/RankProfile.java