Node: http://boardoftrustees-elk.kb.westeurope.azure.elastic-cloud.com:9243/, status: 400, [es/indices.create] Expecting JSON data but response content-type is: application/octet-stream

[dadoonet (David Pilato)]

I think it comes with the wrong content type because you are not hitting the right endpoint. I can see in the capture that your are using http and not https.