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在 solr 中,如果我使用 BALANCESHARDUNIQUE,它会将 PreferredLeader 属性分配给节点,并且在执行 REBALANCESHARDS 之后,preferredLeader 被选为该分片的领导者,但是如果 PreferredLeader 稍后关闭会发生什么,它会等待 PreferredLeader 恢复并且分片将不可用,直到然后或将选举新的领导人