The client used to connect to Google Cloud Storage has a number of settings available. Client setting names are of the form gcs.client.CLIENT_NAME.SETTING_NAME and specified inside elasticsearch.yml. The default client name looked up by a gcs repository is called default, but can be customized with the repository setting client.

For example:

PUT _snapshot/my_gcs_repository
{
  "type": "gcs",
  "settings": {
    "bucket": "my_bucket",
    "client": "my_alternate_client"
  }
}

Some settings are sensitive and must be stored in the elasticsearch keystore. This is the case for the service account file:

bin/elasticsearch-keystore add-file gcs.client.default.credentials_file

The following are the available client settings. Those that must be stored in the keystore are marked as Secure.