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Cluster update settings API

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Cluster update settings API

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Configures dynamic cluster settings.

Request

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PUT /_cluster/settings

Prerequisites

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If the Elasticsearch security features are enabled, you must have the manage cluster privilege to use this API.

Description

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You can configure and update dynamic settings on a running cluster using the cluster update settings API. You can also configure dynamic settings locally on an unstarted or shut down node using elasticsearch.yml.

Updates made using the cluster update settings API can be persistent, which apply across cluster restarts, or transient, which reset after a cluster restart. You can also reset transient or persistent settings by assigning them a null value using the API.

If you configure the same setting using multiple methods, Elasticsearch applies the settings in following order of precedence:

Transient setting
Persistent setting
elasticsearch.yml setting
Default setting value

For example, you can apply a transient setting to override a persistent setting or elasticsearch.yml setting. However, a change to an elasticsearch.yml setting will not override a defined transient or persistent setting.

If you use Elasticsearch Service, use the user settings feature to configure all cluster settings. This method lets Elasticsearch Service automatically reject unsafe settings that could break your cluster.

If you run Elasticsearch on your own hardware, use the cluster update settings API to configure dynamic cluster settings. Only use elasticsearch.yml for static cluster settings and node settings. The API doesn’t require a restart and ensures a setting’s value is the same on all nodes.

We no longer recommend using transient cluster settings. Use persistent cluster settings instead. If a cluster becomes unstable, transient settings can clear unexpectedly, resulting in a potentially undesired cluster configuration.

Query parameters

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flat_settings: (Optional, Boolean) If true, returns settings in flat format. Defaults to false.
include_defaults: (Optional, Boolean) If true, returns all default cluster settings. Defaults to false.
master_timeout: (Optional, time units) Period to wait for the master node. If the master node is not available before the timeout expires, the request fails and returns an error. Defaults to 30s. Can also be set to -1 to indicate that the request should never timeout.
timeout: (Optional, time units) Period to wait for a response from all relevant nodes in the cluster after updating the cluster metadata. If no response is received before the timeout expires, the cluster metadata update still applies but the response will indicate that it was not completely acknowledged. Defaults to 30s. Can also be set to -1 to indicate that the request should never timeout.

Examples

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An example of a persistent update:

resp = client.cluster.put_settings(
    persistent={
        "indices.recovery.max_bytes_per_sec": "50mb"
    },
)
print(resp)

response = client.cluster.put_settings(
  body: {
    persistent: {
      'indices.recovery.max_bytes_per_sec' => '50mb'
    }
  }
)
puts response

const response = await client.cluster.putSettings({
  persistent: {
    "indices.recovery.max_bytes_per_sec": "50mb",
  },
});
console.log(response);

PUT /_cluster/settings
{
  "persistent" : {
    "indices.recovery.max_bytes_per_sec" : "50mb"
  }
}

An example of a transient update:

resp = client.cluster.put_settings(
    flat_settings=True,
    transient={
        "indices.recovery.max_bytes_per_sec": "20mb"
    },
)
print(resp)

response = client.cluster.put_settings(
  flat_settings: true,
  body: {
    transient: {
      'indices.recovery.max_bytes_per_sec' => '20mb'
    }
  }
)
puts response

const response = await client.cluster.putSettings({
  flat_settings: "true",
  transient: {
    "indices.recovery.max_bytes_per_sec": "20mb",
  },
});
console.log(response);

PUT /_cluster/settings?flat_settings=true
{
  "transient" : {
    "indices.recovery.max_bytes_per_sec" : "20mb"
  }
}

The response to an update returns the changed setting, as in this response to the transient example:

{
  ...
  "persistent" : { },
  "transient" : {
    "indices.recovery.max_bytes_per_sec" : "20mb"
  }
}

This example resets a setting:

resp = client.cluster.put_settings(
    transient={
        "indices.recovery.max_bytes_per_sec": None
    },
)
print(resp)

response = client.cluster.put_settings(
  body: {
    transient: {
      'indices.recovery.max_bytes_per_sec' => nil
    }
  }
)
puts response

const response = await client.cluster.putSettings({
  transient: {
    "indices.recovery.max_bytes_per_sec": null,
  },
});
console.log(response);

PUT /_cluster/settings
{
  "transient" : {
    "indices.recovery.max_bytes_per_sec" : null
  }
}

The response does not include settings that have been reset:

{
  ...
  "persistent" : {},
  "transient" : {}
}

You can also reset settings using wildcards. For example, to reset all dynamic indices.recovery settings:

resp = client.cluster.put_settings(
    transient={
        "indices.recovery.*": None
    },
)
print(resp)

response = client.cluster.put_settings(
  body: {
    transient: {
      "indices.recovery.*": nil
    }
  }
)
puts response

const response = await client.cluster.putSettings({
  transient: {
    "indices.recovery.*": null,
  },
});
console.log(response);

PUT /_cluster/settings
{
  "transient" : {
    "indices.recovery.*" : null
  }
}

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