private DataType createMapType(int id, DocumentmanagerConfig.Datatype.Maptype map) {
            DataType keyType = getOrCreateType(map.keytype());
            DataType valType = getOrCreateType(map.valtype());
            MapDataType type = new MapDataType(keyType, valType, id);
            inProgress(type);
            return type;
        }
One-shot configuration; should be called on a newly constructed manager
document/src/main/java/com/yahoo/document/DocumentTypeManagerConfigurer.java