in Elasticsearch 2.0: field names may not contain dots

[ultrasaurus]

For now, we need to use 1.x -- I'm using 1.7.2 which works fine.

https://www.elastic.co/guide/en/elasticsearch/reference/2.0/breaking_20_mapping_changes.html#_field_names_may_not_contain_dots

We will need to create an alternate syntax, at least internally so we don't send elasticsearch fields with dots in them since we don't want to stay in old-version-land forever.