Logstash empty range in char class error

[The-morpho]

Hello, I'm new to Elasticsearch

I'm working with log files comming from filebeat and Filebeat and I'm trying to add a field "response_time", and then affect the difference between timestamp to It.
So I create a logstash's filter but When I run it on Grok Debugger, this is an exemple of the Filter I'm using.

  filter {
  aggregate {
        add_field => {
          "response_time" => "timestamp2-timestamp1"
		  }
   json {
     match => [ "message", "%{LOGLEVEL:loglevel},%{DATESTAMP_RFC2822:timestamp},%{NOTSPACE:event_type},%{NUMBER :capture_res_id},%{NUMBER :capture_pid},%{NUMBER :mti},%{NUMBER :node_id}
	 ,%{UUID:msg_uuid},%{NOTSPACE:module},%{NUMBER :respCode}]
   }
   if [event_type] == "request_inc" {
     aggregate {
	   msg_uuid => "%{UUID}"
	   timestamp1 => event.get('DATESTAMP_RFC2822')
       code => "map['response_time'] = 0"
       map_action => "create"
     }
   }

   if [event_type] == "response_outg" {
     aggregate {
	   msg_uuid => "%{UUID}"
       event_type => event.set('event_type')
	   timestamp2 => "%{DATESTAMP_RFC2822}"
       code => "map['response_time']"
       map_action => "update"
	   end_of_task => true
	   timeout =>120
     }
   }
 }

And this is an exemple of my log file:

{"log_level":"INFO","timestamp":"2021-12-15T16:06:24.400087Z","event_type":"s_tart","ca_id":"11","c_pid":"114","mti":"00","node_id":"00","msg_uuid":"1234","module":"cmde"}
{"log_level":"INFO","timestamp":"2021-12-15T16:06:31.993057Z","event_type":"e_nd","mti":"00","node_id":"00","msg_uuid":"1234","module":"PWC-cmde","respCode":"1"}