es索引分片重新分配cluster.routing.allocation

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本文介绍了Elasticsearch中用于控制索引分片分配的过滤规则，包括index.routing.allocation.include,require和exclude设置。这些设置允许基于节点的属性如名称、IP地址、主机名、节点ID和数据层角色来指定索引应分配到哪些节点。例如，可以设定将索引分配给具有特定大小存储的节点，排除特定IP范围的节点，或者要求节点必须在特定的数据层和机架上。

Index-level shard allocation filtering | Elasticsearch Guide [master] | Elastic

index.routing.allocation.include.{attribute}

Assign the index to a node whose {attribute} has at least one of the comma-separated values.

index.routing.allocation.require.{attribute}

Assign the index to a node whose {attribute} has all of the comma-separated values.

index.routing.allocation.exclude.{attribute}

Assign the index to a node whose {attribute} has none of the comma-separated values.

The index allocation settings support the following built-in attributes:

`_name`	Match nodes by node name
`_host_ip`	Match nodes by host IP address (IP associated with hostname)
`_publish_ip`	Match nodes by publish IP address
`_ip`	Match either `_host_ip` or `_publish_ip`
`_host`	Match nodes by hostname
`_id`	Match nodes by node id
`_tier`	Match nodes by the node’s data tier role. For more details see data tier allocation filtering

PUT test/_settings
{
  "index.routing.allocation.include.size": "big,medium"
}

PUT test/_settings
{
  "index.routing.allocation.exclude._ip": "192.168.2.*,192.168.3.*"
}

PUT test/_settings
{
  "index.routing.allocation.require.size": "big",
  "index.routing.allocation.require.rack": "rack1"
}