elasticsearch host quick fix

Summary: Quick fix for the elasticsearch search engine Ref T8274

Test Plan: Did a couple of searches

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T8274

Differential Revision: https://secure.phabricator.com/D12967