class Article
  include Mongoid::Document
  include Mongoid::Timestamps::Short
  include ActiveModel::ForbiddenAttributesProtection

  field :name
  field :tags

  include Mongoid::Elasticsearch
  i_fields = {
    name:     {type: 'string', analyzer: 'snowball'},
    raw:      {type: 'string', index: :not_analyzed}
  }

  if Gem::Version.new(::Elasticsearch::Client.new.info['version']['number']) > Gem::Version.new('0.90.2')
    i_fields[:suggest] = {type: 'completion'} 
  end

  elasticsearch! index_name: 'mongoid_es_news', prefix_name: false, index_mappings: {
    name: {
      type: 'multi_field',
      fields: i_fields
    },
    tags: {type: 'string', include_in_all: false}
  }, wrapper: :load
end