Elasticsearch集群节点磁盘使用分配不均解决办法

Elasticsearch集群节点磁盘使用分配不均原因主要是template分片分配不均

将elasticsearch 的分片数调大，最好跟节点数一致。

  "settings": {
    "index": {
      "number_of_shards": 10,
      "number_of_replicas": 1
    }
  }

方法1.可以尝试调节cluster.routing.allocation.disk.watermark

cluster.routing.allocation.disk.watermark.low: 默认 85% 当达到时，replica 不再写入
cluster.routing.allocation.disk.watermark.high: 默认 90% 当达到时，shards 会尝试写入其他节点
cluster.routing.allocation.disk.watermark.flood_stage: 默认 95% 当达到时，所有索引变为 readonly状态

PUT /_cluster/settings

{
  "transient" : {
    "cluster" : {
      "routing" : {
        "allocation" : {
          "cluster_concurrent_rebalance" : "2",
          "node_concurrent_recoveries" : "2",
          "disk" : {
            "watermark" : {
              "low" : "75%",
              "flood_stage" : "95%",
              "high" : "79%"
            }
          }
        }
      },
      "max_shards_per_node" : "15000"
    }
  }
}

方法2. reindex

    POST _reindex?slices=9&refresh&wait_for_completion=false
{
  "source": {
    "index": "my_index",    "size": 10000

  },
  "dest": {
    "index": "my_index_new"
  }
}