Hi Luka!
For all hosted clusters, the best place for a faster support is opening a support ticket here:
This will allow us to directly access your cluster logs and metrics.
Can you share the entire stack trace?
I have seen this kind of error on old versions of Weaviate, and happening due to Weaviate not handling vectorizer or generative 5XX error response.
So most probably your vectorizer failed (considering it was on ingestion), and Weaviate have not presented the error message on a readable way (apart from the " [usage error (500)…]"
Let me know if this helps!
Thanks!