def batch_search(searches, additional_headers = {})
      url_friendly_searches = searches.each_with_index.map do |search, index|
        { index => search }
      end
      searches_query = { search: url_friendly_searches }
      request_url = "#{base_url}/batch_search.json?#{Rack::Utils.build_nested_query(searches_query)}"
      get_json(request_url, additional_headers)
    end
def batch_search(searches, additional_headers = {})
      url_friendly_searches = searches.each_with_index.map do |search, index|
        { index => search }
      end
      searches_query = { search: url_friendly_searches }
      request_url = "#{base_url}/batch_search.json?#{Rack::Utils.build_nested_query(searches_query)}"
      get_json(request_url, additional_headers)
    end
Perform a batch search.

 @param searches [Array] An array valid search queries. Maximum of 6. See search-api documentation for options.

 # @see https://github.com/alphagov/search-api/blob/master/doc/search-api.md