Filebeat field rename does not work

Hello,
the file rename does not work inmy configuration. Any idea why?
filebeat version is 7.6.0 or 7.6.1 (tested with both).
The logs are shipped to graylog.

 # Set directory for additional inputs:
filebeat.config.inputs:
  enabled: true
  path: /etc/filebeat/conf.d/*.yml

filebeat:
output:
    logstash:
      hosts:
        - 10.247.x.yyy:12204
        - 10.247.x.yyy:12204
        - 10.247.x.yyy:12204
        - 10.247.x.yyy:12204
        - 10.247.x.yyy:12204
      loadbalance: true
processors:
- decode_json_fields:
    fields: ['message']
    target: ""
#    overwrite_keys: true
    max_depth: 4
    add_error_key: true

# rename log_file_path to path to be compatible with logstash
- rename:
    fields:
      - from: "log_file_path"
        to: "path"
#    ignore_missing: true
#    fail_on_error: true

- timestamp:
    field: 'dateTime'
    timezone: 'UTC'
    layouts:
    - '2006-02-01T15:04:05.000 UTC'
    - '01/02/2006 15:04:05.000 UTC'
    test:
    - '12/10/2019 14:44:27.267 UTC'
    - '12/31/2019 14:44:27.267 UTC'

# Logging
logging.level: info  # default info. One of debug, info, warning, error

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