Elasticsearch box_type switch from hot to warm automatically

I am using Elasticsearch 6.2.4, and I migrate some historical data from old cluster to a new one.The historical data would not be used recently,so I set box_type to warm.
But after I migrate the data to the new cluster,I find box_type had been changed to hot. And I do not know why this happened.
Hoping for your help, thank you.

box_type is not a native Elasticsearch structure, but likely a node attribute. It's not possible to tell why you're seeing a particular node attribute show up without some more details on your configuration.

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