Fix Response Debug assertions

This commit fixes the response debug assertions to
verify that it contains the expected debug information

(cherry picked from commit 08fdb0b)

Author: russcam

elasticsearch/tests/client.rs

@@ -218,11 +218,9 @@ async fn search_with_body() -> Result<(), failure::Error> {
     assert_eq!(response.status_code(), StatusCode::OK);
     assert_eq!(response.method(), elasticsearch::http::Method::Post);
     let debug = format!("{:?}", &response);
-    assert_eq!(
-        format!("Response {{ method: Post, url: \"{}\", status_code: 200, headers: {{\"content-type\": \"application/json; charset=UTF-8\"}} }}",
-                expected_url.as_str()),
-        debug);
-
+    assert!(debug.contains("method"));
+    assert!(debug.contains("status_code"));
+    assert!(debug.contains("headers"));
     let response_body = response.json::<Value>().await?;
     assert!(response_body["took"].as_i64().is_some());