Is your cluster exposed to the internet?
No, they are in a closed network
Do you have access control to the cluster?
Suggests to me that someone got access to your cluster, deleted everything and replaced it with that index.
A mapping cannot delete indices, it's just not possible. Did you check the logs of Elasticsearch as well?
Is there a reason that you have removed all the details in this thread?
Fake alarm, I had a noob error, wrong ip.
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