tire ngram analyzer

ngram_config.rb

settings analysis: {
  filter: {
    ngram_filter: {
      type: "nGram",
      min_gram: 3,
      max_gram: 8
    }
  },
  analyzer: {
    ngram_analyzer: {
      tokenizer: "lowercase",
      filter: ["ngram_filter"],
      type: "custom"
    }
  }
} do
  mapping do
    [:name, :email, :company].each do |attribute|
      indexes attribute, type: 'string', analyzer: 'ngram_analyzer'
    end
  end
end