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Use m_m_nodes from Zen1 master for Zen2 bootstrap (#37701)
Today we support a smooth rolling upgrade from Zen1 to Zen2 by automatically bootstrapping the cluster once all the Zen1 nodes have left, as long as the `minimum_master_nodes` count is satisfied. However this means that Zen2 nodes also require the `minimum_master_nodes` setting for this one specific and transient situation. Since nodes only perform this automatic bootstrapping if they previously belonged to a Zen1 cluster, they can keep track of the `minimum_master_nodes` setting from the previous master instead of requiring it to be set on the Zen2 node.
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