collection vs _type

[jduss4]

The API appears to be using collection instead of _type, and though that's not ideal at least for the meantime we should probably make sure that _type and collection always match.

It could be added during the es_post step of file_type, but then using the -o won't reflect all the contents that are actually being sent to ES. I think instead we might want to change how the various file types are using the transform and output step so that output happens more distinctly.

[jduss4]

So far we have just been manually adding collection but this should be baked into datura as a check before any documents can be sent.