elasticsearch with fields

In Model:-
require 'elasticsearch/model'
class User < ActiveRecord::Base
  include Elasticsearch::Model
   after_save :reindex_users
  before_destroy :reindex_users

  settings index: { number_of_shards: 2, number_of_replicas: 0 } do
    mapping do    
      indexes :skills
      indexes :country
      indexes :developer      
    end
  end



  def reindex_users
    if self.changed?
      self.__elasticsearch__.index_document
      # self.user.__elasticsearch__.index_document
       #self.jobbers.__elasticsearch__.index_document
    end
  end

  def self.search(skills,developer,country)
  __elasticsearch__.search(
    {      
        query: { query_string: {
         query: "skills:\"#{skills}\" OR developer:\"#{developer}\"  OR country:\"#{country}\""
      }}

  
  }
  )
end

end

In Controller:-

@users =  User.search(params[:skills],

params[:developer],params[:country]).records