How to grok using json filter

Elastic Stack Logstash
5

Hi,

I tried to break it for small pieces but still can't cross this rock.
I would like that every field of the json will have a unique target line but in the same entry.
Anyway, nothing is working to me.

This is my input:

Timestamp:2017-05-24 09:43:11.733 "requestUrl" : "ecommerce/user/register", "response" : "{"errorCode":"000202","errorMessage":"One or more inputs are invalid","transactionId":"af280fcb-1e5b-4731-a11e-d11b1f286e34"}"

This is my logstash filter

    if [type] == "json1" {
            mutate {
                    uppercase => [ "severity" ]
            }
            grok {
                  tag_on_failure => ["_grokparsefailure" , "_jsonparsefailure" ]
                  break_on_match => true
                  keep_empty_captures => false
                  match => { "message" => "Timestamp:%{TIMESTAMP_ISO8601:timestamp}  %{GREEDYDATA:jsonstring}"
                  }
                  patterns_dir => "/etc/logstash/patterns"
            }
            date {                      
                  match => [ "timestamp" , "yyyy-MM-dd HH:mm:ss,SSS", "yyyy-MM-dd HH:mm:ss aa" , "yyyy-MM-dd HH:mm:ss.SSS" , "ISO8601" ]
            }
            json {
                  source => "jsonstring"
                  target => "doc"
            }
            mutate {
               add_field => {
                  "requestUrl" => "%{[doc][requestUrl]}"
                  "response" => "%{[doc][response]}"
               }
            }
    }

And this is the output:

2017_07_26_20_49_09_Kibana.jpg952×668 128 KB

Really need help here!!!
Thanks
Sharon.