Elasticsearch versioning through Tire gem
I have an existing Rails app that uses tire (0.4.0) to interface with an Elasticsearch (0.17.4) engine. It already has a couple of models using Tire::Persistence. I want to add a new model that takes advantage of Elasticsearch versioning, to track all changes and be able to revert to previous versions.

Right now when I retrieve any 'persisted' model instance, I check `_version` and it is always `nil`. I have not found any tire documentation that relates to versioning. Do I have to activate it somehow, or manually save records with version values? Am I even on the right track here?
Elasticsearch versioning through Tire gem
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I have an existing Rails app that uses tire (0.4.0) to interface with an Elasticsearch (0.17.4) engine. It already has a couple of models using Tire::Persistence. I want to add a new model that takes advantage of Elasticsearch versioning, to track all changes and be able to revert to previous versions.

Right now when I retrieve any 'persisted' model instance, I check `_version` and it is always `nil`. I have not found any tire documentation that relates to versioning. Do I have to activate it somehow, or manually save records with version values? Am I even on the right track here?