Access ElasticSearch over secure communication

[nateiam]

As a Herd Developer I want to access ElasticSearch over a secure communication channel so I am compliant with security requirements.

Acceptance Criteria

• Communication between Herd and ElasticSearch occurs over encrypted channel
• Communication over insecure channel is prohibited
• Authentication occurs between Herd and ElasticSearch to prevent anyone except Herd from speaking to ElasticSearch
• Infrastructure is integrated into existing ElasticSearch deployment automation developed in #260