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

{
  "indices.get_aliases": {
    "documentation": "http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/indices-aliases.html",
    "methods": ["GET"],
    "url": {
      "path": "/_aliases",
      "paths": ["/_aliases", "/{index}/_aliases"],
      "parts": {
        "index": {
          "type" : "list",
          "description" : "A comma-separated list of index names to filter aliases"
        }
      },
      "params": {
        "timeout": {
          "type" : "time",
          "description" : "Explicit operation timeout"
        }
      }
    },
    "body": null
  }
}