I wrote my solution there I updated the “opendistroforelasticsearch-kibana” package via apt. The package was not updated before so the email option was missing.
I was confused about the versions, and didn’t noticed that “alerting email” was not supported in version 7.8.0… For new deployments I will use current version, but for already deployed Opendistros finally we created a solution using webhook and email python script…