It looks like providing support for SSL would be a simple configuration change here: https://github.com/Teradata/kylo/blob/2ed5a251583cc700ad7c6371b110a47f069e43ce/plugins/search-elasticsearch-rest/src/main/java/com/thinkbiganalytics/search/ElasticSearchRestService.java#L185
This work may be needed before can be completed, but is independently desirable since any it is required to support any ES cluster that requires SSL (e.g. AWS ElasticSearch).
This issue was really hard to find because both assignee and reporter were inactive accounts.
keywords: elastic search SSL https elasticsearch