/ snapshot/ all

 /_snapshot/_all?pretty

{
  "gcs_repo" : {
    "type" : "gcs",
    "settings" : {
      "bucket" : "your-backup-elastic",
      "client" : "default",
      "base_path" : "elasticsearch-backups",
      "compress" : "true"
    }
  }
}

Related

• GET /_cat/indices

See also

• Elasticsearch snapshots
• Elasticsearch: /_cat/, /_nodes/, /_cluster/, /_snapshot/, /_ilm/, /_xpack/, /_search/, /_security/, /my-index/, /_bulk