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 [7.2] ›Configuring Journalbeat ›Filter and enhance the exported data

Keep fields from events

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Keep fields from events

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The include_fields processor specifies which fields to export if a certain condition is fulfilled. The condition is optional. If it’s missing, the specified fields are always exported. The @timestamp and type fields are always exported, even if they are not defined in the include_fields list.

processors:
 - include_fields:
     when:
        condition
     fields: ["field1", "field2", ...]

See Conditions for a list of supported conditions.

You can specify multiple include_fields processors under the processors section.

If you define an empty list of fields under include_fields, then only the required fields, @timestamp and type, are exported.

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