[WATCHER] Failed to Transform payload - Keyword field


I am trying to configure a Watcher of a machine learning job.
The ML job is a population job that works with keyword fields.

A cause of using the keyword field, watcher gives me this error:

This is the search of the watcher:

This is the original payload all good till here:

Tranform payload error:

I cannot access to fields keyword!!! What can I do?

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