The Saved Objects Export API (and corresponding UI feature) can optionally retrieve all references when exporting saved objects.

If the requested object references a non-existent object, the export operation will fail altogether.

I think it would be better if the export succeeded, or at least allowed for partial success.

curl 'http://localhost:5601/api/saved_objects/_export' -H 'kbn-version: 8.0.0' -H 'Content-Type: application/json' --data-binary '{"objects":[{"id":"722b74f0-b882-11e8-a6d9-e546fe2bba5f","type":"dashboard"}],"includeReferencesDeep":true}'

{"statusCode":400,"error":"Bad Request","message":"Bad Request","attributes":{"objects":[{"id":"3ba638e0-b894-11e8-a6d9-e546fe2bba5f","type":"search","error":{"statusCode":404,"message":"Not found"}},{"id":"2c9c1f60-1909-11e9-919b-ffe5949a18d2","type":"map","error":{"statusCode":404,"message":"Not found"}}]}}```