Node pool upgrade

Hi Elastic team,

I have deployed Elasticsearch 6.x in GKE and I want to perform node pool upgrade. I have checked this doc

I will create ES nodes on the new machine, stop all balancing and reallocation, and will reroute all data shards to new ES nodes.

My question is that can I migrate all data shards at once without any downtime ( or increase in search fetch time ) or should I do it one by one or any other number.

Thanks for your support.

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