@Override
    public void getConfig(DocumentmanagerConfig.Builder builder) {
        if (containerDocumentApi != null)
            builder.ignoreundefinedfields(containerDocumentApi.ignoreUndefinedFields());
    }
Returns all components in this cluster (generic, handlers, chained)
config-model/src/main/java/com/yahoo/vespa/model/container/ContainerCluster.java