[TEST] Fix issue parsing response out of order

When parsing GetResponse it was possible that the equality check failed because
items in the map were in a different order (in the `.equals` implementation).

server/src/test/java/org/elasticsearch/action/get/GetResponseTests.java

@@ -81,7 +81,7 @@ private void doFromXContentTestWithRandomFields(boolean addRandomFields) throws
             parsedGetResponse = GetResponse.fromXContent(parser);
             assertNull(parser.nextToken());
         }
-        assertEquals(expectedGetResponse, parsedGetResponse);
+        assertEquals(expectedGetResponse.getSourceAsMap(), parsedGetResponse.getSourceAsMap());
         //print the parsed object out and test that the output is the same as the original output
         BytesReference finalBytes = toXContent(parsedGetResponse, xContentType, humanReadable);
         assertToXContentEquivalent(originalBytes, finalBytes, xContentType);