OpenSearch/rest-api-spec/api/cat.help.json

{
  "cat.help": {
    "documentation": "http://www.elasticsearch.org/guide/en/elasticsearch/reference/master/cat.html",
    "methods": ["GET"],
    "url": {
      "path": "/_cat",
      "paths": ["/_cat"],
      "parts": {
      },
      "params": {
        "help": {
          "type": "boolean",
          "description": "Return help information",
          "default": false
        }
      }
    },
    "body": null
  }
}