[BUG]Unable to parse date

[sashalarsoo]

I have the following processor:

- date:
            match:
              - key: /attributes/log.attributes.TIME_STAMP
                patterns:
                  - "MMM dd, yyyy @ HH:mm:ss.SSS"
            destination: "@timestamp"
            locale: en
            date_when: "/attributes/log.attributes.TIME_STAMP != null"

matching on

but i looks like nothing happend i would like the TIME_STAMP to be copied on @timestamp.

[dlvenable]

@sashalarsoo , Would you be able to create a unit test that reproduces this? And if you have a code fix, that would be even better.

From my initial look at the configuration, this appears to be a valid configuration.