@Override
    public void getConfig(StorDistributionConfig.Builder builder) {
        if (rootGroup != null) {
            builder.group.addAll(rootGroup.getGroupStructureConfig());
        }

        if (redundancy != null) {
            redundancy.getConfig(builder);
        }

        if (search.usesHierarchicDistribution()) {
            builder.active_per_leaf_group(true);
        }
    }
Returns a list of th document types declared at the cluster level.
config-model/src/main/java/com/yahoo/vespa/model/content/cluster/ContentCluster.java