By reading the docs, I saw there were some APIs to check ILM status:
https://www.elastic.co/guide/en/elasticsearch/reference/current/ilm-get-status.html
But the API seems to not be available:
curl -X GET "https://xxx.europe-west1.gcp.cloud.es.io:9243/_ilm/status" -u "elastic:xxx"
{"error":"Incorrect HTTP method for uri [/_ilm/status] and method [GET], allowed: [POST]","status":405}%
Is the documentation wrong or just the API not available ?