We have this pipeline:
PUT _ingest/pipeline/j2-e2a-test
{
  "processors": [
    {
      "grok": {
        "field": "message",
        "patterns": [
          "(?m)(?<myfulldate>%{DATE_EU}\\s+%{TIME})\\s+(%{WORD:loglevel}\\s+)\\s+(?<Correl_id>([\\h]{8}-[\\h]{4}-[\\h]{4}-[\\h]{4}-[\\h]{12}))\\s+\\[(?<Thread_ID>[0-9]{1,2})\\]\\s+(?<Function>\\((.*?)\\))\\s+?%{GREEDYDATA:message}"
        ]
      }
    },
    {
      "date":{
        "field": "myfulldate",
        "formats": ["dd.MM.yyyy HH:mm:ss.SSS"],
        "target_field": "@timestamp",
        "ignore_failure": true,
        "timezone": "Europe/Berlin"
      }
    }
  ]
}
this message:
20.06.2021 04:13:18.492 INFO    2e49acf6-3f65-4c4e-bcdf-354435c83648 [9] (Storage.StorageStaticFactory.Create) (?.?) Es ist kein Anbieter für einen externen Speicher '' hinterlegt
We have the problem, that our datetime, is not converting to the @timestamp.