Filebeat Multiline not working

Hi, i want to regroup lines in log file (5 lines max), i want to regroup lines until (default task-XX) This is my filebeat config :

fields_under_root: true
  multiline.type: pattern
  multiline.pattern: '[0-9]{4}-[0-9]{2}-[0-9]{2} [0-9]{2}:[0-9]{2}:[0-9]{2},[0-9]{3} * [A-Z]{3,5} * \[*[a-z]{1,10}\] * \(([^)]+)\)'
  multiline.negate: false
  multiline.match: after
  multiline.max_lines: 5

Here is an example of lines :

2021-06-16 10:32:57,679 ERROR [stderr] (default task-51) com.itnsa.fwk.exception.T9RuntimeException: Ce contrat est introuvable pour POL_IDENT = [11 381 782], traitement impossible

2021-06-16 10:32:57,679 ERROR [stderr] (default task-51) 	at com.itnsa.assurance.soa.impl.SOAChargementContratImpl.chargeme

2021-06-16 10:32:57,679 ERROR [stderr] (default task-84) com.itnsa.fwk.exception.T9RuntimeException: Ce contrat est introuvable pour POL_IDENT = [11 381 782], traitement impossible

2021-06-16 10:32:57,679 ERROR [stderr] (default task-84) 	at com.itnsa.assurance.soa.impl.SOAChargementContratImpl.chargeme

2021-06-16 10:32:57,679 ERROR [stderr] (default task-84) com.itnsa.fwk.exception.T9RuntimeException: Ce contrat est introuvable pour POL_IDENT = [11 381 782], traitement impossible

Combination of lines is not working please help me for this.

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