Hi @mom-douellet, thanks for the information.
Indeed the problem looks very similar to yours (100% cpu always, data inter node about 10 TB! And we ingested like only 8GB in the interval). I'm not in my working computer right now but I will provide a view of what happened:
After nobody from elastic mod team could help here, I had to "pay to play". As I am the only one managing the cluster I upgraded my license to platinum and filled an urgent ticket. My cluster was green but useless in this meantime, and I couldn't wait three business days, the SLA for normal things.
The engineers were very kind, provided two fixes during one day, and sent me a bunch of commands to run in dev tools a few times (4 hours interval, run the command).
And then the elastic dev team solved the issue and fixed the cluster.
I think you should do a rollback if you can (I couldn't find this option in elastic cloud). Probably elastic will provide a wider fix in the next days/weeks for the public. Hope the best for your cluster.