speed up rspec tests using elasticsearch by bypass useless connections to the elasticsearch server

Gemfile

# Gemfile
group :test do
  gem "webmock"
end

some_spec.rb

describe Club, "#search", elasticsearch: true do
  before {...}
  it "can search by keyword" do
    Club.search(keyword: 'Hawaii', min_score: 0).count.should eql(1)
  end
end

spec_helper.rb

# spec/spec_helper.rb
RSpec.configure do |config|
  config.before(:each) do
    if example.metadata[:elasticsearch]
      Club.tire.index.delete
      Club.tire.create_elasticsearch_index
    else
      stub_request(:any, %r|#{ENV['ELASTIC_SEARCH_URL']}|).to_return({
        body: {}.to_json,
        headers: {content_type: "application/json"}
      })
    end
  end
end