elasticsearch ngram config

elasticsearch_ngram.rb

class Author < ActiveRecord::Base
  include Tire::Model::Search
  include Tire::Model::Callbacks
  include TireHelpers

  has_many :books

  validates :name, presence: true

  normalize_attributes :name

  settings analysis: {
    analyzer: {
      filter: {
        name_ngram: {
          # type:     "nGram",
          type:     "edgeNGram",
          side:     "front",
          max_gram: 10,
          min_gram: 1
        }
      },
      analyzer: {
        name_analyzer: {
          tokenizer: "lowercase",
          filter: ["stop", "name_ngram"]
        }
      }
    }
  }

  mapping do
    indexes :name, type: :string, analyzer: :name_analyzer
  end

  def to_indexed_json
    AuthorSerializer.new(self).to_json
  end
end

  settings analysis: {
    analyzer: {
      italian_text: {
        tokenizer: 'standard',
        filter: ['word_delimiter', 'lowercase'],
        type: 'custom'
      }
    }
  }