Metricbeat - Add a custom field with existing value

How can i add a custom field whose value will be equal to an exiting field


Sorry for the late response. I believe you can use the add_fields processor in Metricbeat:

Yes, I know that new fields can be added. But my question is if that new field's value can be set from existing field-value.
For example make the new field value equal to the
Since has the value equal to hostname of that system and which is already set by the metricbeat.

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