es unassigned shards 解决

服务器宕机后，es出现unassigned shards，使用reroute 命令提示 shard has exceeded the maximum number of retries，即使加上 retry_failed=true参数也无法解决。经过多次尝试和网上查询，发现通过以下步骤可以解决该问题：

禁用allocation配置

PUT _cluster/settings
{"persistent": {"cluster.routing.allocation.enable": "none"}
}

重置计数器

   POST /_cluster/reroute?retry_failed=true

执行reroute命令

POST /_cluster/reroute
{"commands": [{"allocate_replica": {"index": "xx","shard": 0,"node": "AQ7l1ti9RqejnLg2HN0q1A"}}]
}

启用allocation配置

   PUT _cluster/settings{"persistent": {"cluster.routing.allocation.enable": "all"}}

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