Make sure elasticsearch uses version 0.90 apiVersion
Make sure elasticsearch uses version 0.90 apiVersion

Because there is a newer version of elasticsearch, newer versions of the
client will try and use the latest version of the API. To prevent this
we explicitly state which version of the API we want to use.

Sinar/popit-api,mysociety/popit-api,mysociety/popit-api,Sinar/popit-api