public Reindexing with(DocumentType documentType, Status updated) {
        return new Reindexing(Stream.concat(Stream.of(documentType),
                                            status.keySet().stream())
                                    .distinct()
                                    .collect(toUnmodifiableMap(type -> type,
                                                               type -> documentType.equals(type) ? updated : status.get(type))));
    }
Reindexing status per document type.

@author jonmv
clustercontroller-reindexer/src/main/java/ai/vespa/reindexing/Reindexing.java