前台日志：
[2021-02-20T16:57:32,332][INFO ][o.e.c.r.a.DiskThresholdMonitor] [node-1] low disk watermark [85%] exceeded on [qdXzCxNDTFe9UHzoCEzHJA][node-1][/data/server/elasticsearch/data/nodes/0] free: 9.6gb[10.7%], replicas will not be assigned to this node
[2021-02-20T16:58:02,417][INFO ][o.e.c.r.a.DiskThresholdMonitor] [node-1] low disk watermark [85%] exceeded on [qdXzCxNDTFe9UHzoCEzHJA][node-1][/data/server/elasticsearch/data/nodes/0] free: 9.6gb[10.7%], replicas will not be assigned to this node
[2021-02-20T16:58:32,463][INFO ][o.e.c.r.a.DiskThresholdMonitor] [node-1] low disk watermark [85%] exceeded on [qdXzCxNDTFe9UHzoCEzHJA][node-1][/data/server/elasticsearch/data/nodes/0] free: 9.6gb[10.7%], replicas will not be assigned to this node
[2021-02-20T16:59:02,509][INFO ][o.e.c.r.a.DiskThresholdMonitor] [node-1] low disk watermark [85%] exceeded on [qdXzCxNDTFe9UHzoCEzHJA][node-1][/data/server/elasticsearch/data/nodes/0] free: 9.6gb[10.7%], replicas will not be assigned to this node
[2021-02-20T16:59:32,577][INFO ][o.e.c.r.a.DiskThresholdMonitor] [node-1] low disk watermark [85%] exceeded on [qdXzCxNDTFe9UHzoCEzHJA][node-1][/data/server/elasticsearch/data/nodes/0] free: 9.6gb[10.7%], replicas will not be assigned to this node解决办法，在elasticsearch.yml里面加入三行
cluster.routing.allocation.disk.threshold_enabled: false
#cluster.routing.allocation.disk.watermark.low: 30gb
#cluster.routing.allocation.disk.watermark.high: 20gb
