OpenSearch/rest-api-spec/api/list_benchmarks.json

{
    "list_benchmarks" : {
        "documentation": "http://www.elasticsearch.org/guide/en/elasticsearch/reference/master/search-benchmark.html",
        "methods": ["GET"],
        "url": {
            "path": "/_bench",
            "paths": [
                "/_bench",
                "/{index}/_bench",
                "/{index}/{type}/_bench"
            ],
            "parts": {
                "index": {
                    "type" : "list",
                    "description" : "A comma-separated list of index names; use `_all` or empty string to perform the operation on all indices"
                },
                "type": {
                    "type" : "string",
                    "description" : "The name of the document type"
                }
            },
            "params": {}
        },
        "body": null
    }
}