Integrate Logstash or fluentd with Open Distro for Elasticsearch

Hi,

I am trying to use logstash and fluentd in two different Instances to test logs forwarding. However I am get in to some issues which are related to SSL certificates. I could see the logs are receiving to the OpenDistro node in a tcpdump, but nothing has been inserted to the Elasticsearch.

should I need to use https instead of http in all over the configurations? Can you please share a little guide to fix this configuration issue?

Thank you
Luke