@Override
    public void getConfig(BucketspacesConfig.Builder builder) {
        for (NewDocumentType docType : getDocumentDefinitions().values()) {
            BucketspacesConfig.Documenttype.Builder docTypeBuilder = new BucketspacesConfig.Documenttype.Builder();
            docTypeBuilder.name(docType.getName());
            docTypeBuilder.bucketspace(bucketSpaceOfDocumentType(docType));
            builder.documenttype(docTypeBuilder);
        }
    }
Returns the distribution bits this cluster should use.
On Hosted Vespa this is hardcoded and not computed from the nodes because reducing the number of nodes is a common
operation, while reducing the number of distribution bits can lead to consistency problems.
This hardcoded value should work fine from 1-200 nodes. Those who have more will need to set this value
in config and not remove it again if they reduce the node count.
config-model/src/main/java/com/yahoo/vespa/model/content/cluster/ContentCluster.java