Searchkick with Mongoid and Rails 4.0

The biggest thing here is to include searchkick after your fields:

class User                                                                  
  include Mongoid::Document                                                 
  field :user_id, type: Integer                                             
  field :name, type: String       

  searchkick

Then, start the elasticsearch server:

elasticsearch start

In Rails Console:

User.reindex