[#eng-3373] Update ES-equilibrium to work with ES 0.20.0
[#eng-3373] bump ES to 0.20.1
[#eng-3373] stub out HttpInfo interface
[#eng-3373] Fix tests for ES bug in 0.20.1
[#eng-3373] Bump ES to 0.20.2
[#eng-3373] Remove search workaround now that the issue is fixed in ES
Merge remote-tracking branch 'origin/eng-3373-upgrade-to-es-0.20'
Release 0.20.0