elasticsearch中有时会报只能读不能写入

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遇见这个问题多半是磁盘空间不足，可以通过一下操作可解决。

#修改集群报警阈值
PUT _cluster/settings
   {
	  "transient": {
	     "cluster.routing.allocation.disk.watermark.low": "3gb",
	  "cluster.routing.allocation.disk.watermark.high": "1gb",
	  "cluster.routing.allocation.disk.watermark.flood_stage": "1gb",
	  "cluster.info.update.interval": "1m"
	     }
   }

# 添加写权限
PUT _settings
{
"index": {
"blocks": {
"read_only_allow_delete": "false"
        }
    }
}