POST _nodes/reload_secure_settings
POST _nodes/<node_id>/reload_secure_settings

Secure settings are stored in an on-disk keystore. Certain of these settings are reloadable. That is, you can change them on disk and reload them without restarting any nodes in the cluster. When you have updated reloadable secure settings in your keystore, you can use this API to reload those settings on each node.

When the Elasticsearch keystore is password protected and not simply obfuscated, you must provide the password for the keystore when you reload the secure settings. Reloading the settings for the whole cluster assumes that all nodes' keystores are protected with the same password; this method is allowed only when inter-node communications are encrypted. Alternatively, you can reload the secure settings on each node by locally accessing the API and passing the node-specific Elasticsearch keystore password.

The following examples assume a common password for the Elasticsearch keystore on every node of the cluster:

POST _nodes/reload_secure_settings
{
  "secure_settings_password":"s3cr3t"
}
POST _nodes/nodeId1,nodeId2/reload_secure_settings
{
  "secure_settings_password":"s3cr3t"
}

The response contains the nodes object, which is a map, keyed by the node id. Each value has the node name and an optional reload_exception field. The reload_exception field is a serialization of the exception that was thrown during the reload process, if any.

{
  "_nodes": {
    "total": 1,
    "successful": 1,
    "failed": 0
  },
  "cluster_name": "my_cluster",
  "nodes": {
    "pQHNt5rXTTWNvUgOrdynKg": {
      "name": "node-0"
    }
  }
}