No source in es

DO NOT MERGE. I'm creating this for review purposes.

Changes to prevent us from storing source document or source fields in ElasticSearch
See also: https://issues.apache.org/jira/browse/USERGRID-255
I don't think we'll need to re-index old documents since we've already stored them.  This will only apply to new documents.  Can we validate that this default mapping is applied to existing types in ES?  By default the mapping is applied the first time the type is created in ES, we want to be sure it's applied for existing types as well.