Is the _ttl field deprecate or not as announced on this page : https://www.elastic.co/guide/en/elasticsearch/reference/current/mapping-ttl-field.html
I much time are the data, requests, visualisations and dashboards saved on disk, are they saved on disk?
It's deprecated and will be removed.
I am not sure what you mean here.
Thank you for having answered rapidly.
Concerning my second question, I will come back to you with a more precise question.