Secured Elastic Search R connection Error - Client requested protocal TLSv1 not enabled or not supported
In elasticsearch.yml simply set
searchguard.ssl.http.enabled_protocols: - "TLSv1.2" - "TLSv1.1" - "TLSv1"
See also https://github.com/floragunncom/search-guard-ssl/blob/master/searchguard-ssl-config-template.yml