What is the parameter "field_type_refresh_interval"?

I’ve just updated my Graylog to 3.0.2 and I see a new parameter for index sets : field_type_refresh_interval.
What is it ? Can you explain me please ?
I don’t find any documentation about this parameter (https://docs.graylog.org/en/latest/pages/configuration/index_model.html).

The elasticsearch setting is refresh_interval what is the time when the index updates itself to make the content in elasticsearch available for search.

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