rails_elasticsearch_circle.yml

jobs:
  build:
    docker:
      ...      
      - image: docker.elastic.co/elasticsearch/elasticsearch:6.4.2

rails_elasticsearch_docker_compose.yml

  ...
  elasticsearch:
    image: docker.elastic.co/elasticsearch/elasticsearch:6.4.2
    hostname: elasticsearch
     ports:
      - "9200:9200"

rails_elasticsearch_ruby.rb

# searches_controller.rb
class SearchController < ApplicationController
  def execute
    data = if params[:query].blank?
      []
    else
      Store.search(params[:query]).map do |store|
        {
          id: store.id,
          title: store.title,
        }
      end
    end

    render json: { data: data }
  end
end

# searches_spec.rb
require 'rails_helper'

describe SearchController do
  describe '#execute' do
    it 'works' do
      store = Store.create!(title: 'Alexa Shopping Center')

      # The query is misspelled on purpose!
      get '/search?query=Alxa'

      expect(response).to have_http_status(200)
      expect(JSON.parse(response.body)).to eq({
        data: [{
          id: store.id,
          title: store.title,
        },],
      })
    end
  end
end

rails_elasticsearch_vcr.rb

VCR.configure do |config|
  config.ignore_hosts '127.0.0.1', 'localhost', 'elasticsearch'
end