As far as I know, hot node needs 4TB of ssd, how much is cold and frozen node?
Any kind of sizing of any node type will depend on the use case and the expected data volumes the cluster need to support. Without knowledge about the use case, data, retention and query requitements it is impossible to provide any guidance, and that include disk size of hot nodes.
As Christian said, your question is impossible for other people to answer. The only reason a hot node would need 4TB of disk is if you have 4TB of hot data to put on it.
Do you know that the concept of freezing indices is deprecated as of 7.14 and removed as of 8.0?
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