Importing Saved Objects may break Kibana if any of them is missing their IDs

[afharo]

It was fixed on #120693, but somehow, if imported twice, it goes through 🤷

👆 It happens on 7.17.6. However, it seems to work as expected on 8.5.0.

N.B.: I'll provide more details with a test import NDJSON file the next working day.

[elasticmachine]

Pinging @elastic/kibana-core (Team:Core)

[pgayvallet]

Just tried on main, and it cannot be reproduced anymore (even when trying multiple times)

We have an ugly and unexplicit error message:

but the import never go through.

I'll consider the "improve the error message" outside of the scope of the issue (given it would be included in a more global "SOM UX improvement issue) and close it.