About "Rolling upgrades" manual

I have a question abont "Rolling upgrades" manual of Elasticsearch Reference.

In version 6.0+, "cluster.routing.allocation.enable" is set to "none" with "persistent".

But in version 5.6, "cluster.routing.allocation.enable" is set to "none" with "transient".

Does anyone know why this description was changed?
I think version 5.6 manual is correct.

See : https://github.com/elastic/elasticsearch/issues/27860


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