When the license expires, your subscription level reverts to Basic.
If the operator privileges feature is enabled, only operator users can use this API.
manageDELETE /_license
resp = client.license.delete()
const response = await client.license.delete();
response = client.license.delete
$resp = $client->license()->delete();
curl -X DELETE -H "Authorization: ApiKey $ELASTIC_API_KEY" "$ELASTICSEARCH_URL/_license"
client.license().delete(d -> d);