Make QueryReply less verbose as per review feedback

zvelo_api.proto

@@ -36,17 +36,13 @@ message QueryContentRequests {
 message QueryReply {
   Status status              = 1; // The zvelo internal status.
   string request_id          = 2; // The request_ids will identify the request after submission
-  string url                 = 3; // If the original request was a URL request, this will be populated
-  string tracking_id         = 4; // If the original request was a Content request, this will be populated
-  // the target of QueryStatus, to ensure that the QueryStatus call
-  // goes to the same cluster as the original call.
-  // Will only be set if user set p=true in request.
-  string status_url          = 5;
 }
 
 // If a request contained more then one URL, or piece of content, we will reply
 // with this reply. Each sub-query should be reflected in the replies field,
-// and with their own status.
+// and with their own status. The position in the array will correspond to the
+// index in the original array of URL or Content provided in the QueryURLRequests
+// or QueryContentRequests message
 message QueryReplies {
     repeated QueryReply replies = 1;  // this contains a reply for each sub query
     Status status = 2; // this reflects the overall status of the sub-queries