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This functionality is in beta and is subject to change. The design and code is considered to be less mature than official GA features. Elastic will take a best effort approach to fix any issues, but beta features are not subject to the support SLA of official GA features.
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Elastic Docs ›Heartbeat Reference [6.3] ›Configuring Heartbeat ›Filter and Enhance the exported data

Drop fields from events

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Drop fields from events

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The drop_fields processor specifies which fields to drop if a certain condition is fulfilled. The condition is optional. If it’s missing, the specified fields are always dropped. The @timestamp and type fields cannot be dropped, even if they show up in the drop_fields list.

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

See Conditions for a list of supported conditions.

If you define an empty list of fields under drop_fields, then no fields are dropped.

« Drop events Keep fields from events »
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