Truncate fields

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