@Override
    public void getConfig(StorDistributormanagerConfig.Builder builder) {
        builder.minsplitcount(distributionBits());
        if (maxNodesPerMerge != null) {
            builder.maximum_nodes_per_merge(maxNodesPerMerge);
        }
    }
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