This functionality is experimental and may be changed or removed completely in a future release. Elastic will take a best effort approach to fix any issues, but experimental features are not subject to the support SLA of official GA features.
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Elastic Docs ›Journalbeat Reference [7.6] ›Configure Journalbeat ›Filter and enhance data with processors

Truncate fields

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Truncate fields

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The truncate_fields processor truncates a field to a given size. If the size of the field is smaller than the limit, the field is left as is.

fields
List of fields to truncate.
max_bytes
Maximum number of bytes in a field. Mutually exclusive with max_characters.
max_characters
Maximum number of characters in a field. Mutually exclusive with max_bytes.
fail_on_error
(Optional) If set to true, in case of an error the changes to the event are reverted, and the original event is returned. If set to false, processing continues also if an error happens. Default is true.
ignore_missing
(Optional) Whether to ignore events that lack the source field. The default is false, which will fail processing of an event if a field is missing.

For example, this configuration truncates the field named message to 5 characters:

processors:
- truncate_fields:
  fields:
  - message
  max_characters: 5
  fail_on_error: false
  ignore_missing: true
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