GET

        res = RestClient::Request.execute(
        method: :get,
        url: ES_SEARCH_URL,
        timeout: 30,
        headers: {params: params}
      )

POST with JSON body

      res = RestClient::Request.execute(
        method: :post,
        url: url,
        timeout: 30,
        payload: json_body,
        headers: {:content_type=>"application/json", :params => params}
      )

Post without JSON body

      res = RestClient::Request.execute(
        method: :post,
        url: url,
        timeout: 30,
        headers: {:content_type=>"application/json", :params => params}
      )