elasticsearch-model/spec/support/app/article_with_custom_serialization.rb

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#
#   http://www.apache.org/licenses/LICENSE-2.0
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class ::ArticleWithCustomSerialization < ActiveRecord::Base
  include Elasticsearch::Model
  include Elasticsearch::Model::Callbacks

  mapping do
    indexes :title
  end

  def as_indexed_json(options={})
    # as_json(options.merge root: false).slice('title')
    { title: self.title }
  end
end