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

{
  "indices.put_alias": {
    "documentation": "http://www.elasticsearch.org/guide/reference/api/admin-indices-aliases/",
    "methods": ["PUT"],
    "url": {
      "path": "/{index}/_alias/{name}",
      "paths": ["/{index}/_alias/{name}", "/_alias/{name}", "/{index}/_alias", "/_alias"],
      "parts": {
        "index": {
          "type" : "string",
          "required" : true,
          "description" : "The name of the index with an alias"
        },
        "name": {
          "type" : "string",
          "required" : true,
          "description" : "The name of the alias to be created or updated"
        }
      },
      "params": {
        "timeout": {
          "type" : "time",
          "description" : "Explicit timestamp for the document"
        }
      }
    },
    "body": {
      "description" : "The settings for the alias, such as `routing` or `filter`",
      "required"    : false
    }
  }
}