Authentication for ElasticsearchIO seems to be failing

[WARNING] 
org.elasticsearch.client.ResponseException: GET https://a3626ec04ef549318d444cde10db468d.europe-west1.gcp.cloud.es.io:9243/: HTTP/1.1 401 Unauthorized
{"error":{"root_cause":[{"type":"security_exception","reason":"action [cluster:monitor/main] requires authentication","header":{"WWW-Authenticate":["Bearer realm=\"security\"","ApiKey","Basic realm=\"security\" charset=\"UTF-8\""]}}],"type":"security_exception","reason":"action [cluster:monitor/main] requires authentication","header":{"WWW-Authenticate":["Bearer realm=\"security\"","ApiKey","Basic realm=\"security\" charset=\"UTF-8\""]}},"status":401}