Any API to ask specific nodes to leave cluster without shutdown?

Elastic Stack Elasticsearch
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Do we have any way to call API to ask some nodes leave the cluster without shutdown the node?

Also, are there any API to know what is current "replica number" & "shard number" & "min master node number"? Because I hit a problem is when we rolling upgrade Elasticsearch nodes, some nodes set its shard=2 and join to the cluster, but current master set its shard=6, when those nodes with shard=2 become the master, they create indices with shard=2.(Supposedly it should be 6).

I need to make sure at any moment when I ask cluster, they can give me correct info.
PS: Is this normal that in a cluster, some nodes will not respect master settings( for example: shard number)? Supposedly any joined node should receive master node config and every node in the cluster should have consist configuration?

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There is not.

How are you defining the number of shards to be set, in the config file?

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