OpenSearch/rest-api-spec/api/indices.update_aliases.json

{
  "indices.update_aliases": {
    "documentation": "http://www.elastic.co/guide/en/elasticsearch/reference/master/indices-aliases.html",
    "methods": ["POST"],
    "url": {
      "path": "/_aliases",
      "paths": ["/_aliases"],
      "parts": {
      },
      "params": {
        "timeout": {
          "type" : "time",
          "description" : "Request timeout"
        },
        "master_timeout": {
          "type" : "time",
          "description" : "Specify timeout for connection to master"
        }
      }
    },
    "body": {
      "description" : "The definition of `actions` to perform",
      "required" : true
    }
  }
}