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

{
  "suggest": {
    "documentation": "http://elasticsearch.org/guide/reference/api/search/suggest/",
    "methods": ["POST", "GET"],
    "url": {
      "path": "/_suggest",
      "paths": ["/_suggest", "/{index}/_suggest"],
      "parts": {
        "index": {
          "type" : "list",
          "description" : "A comma-separated list of index names to restrict the operation; use `_all` or empty string to perform the operation on all indices"
        }
      },
      "params": {
        "ignore_indices": {
          "type" : "enum",
          "options" : ["none","missing"],
          "default" : "none",
          "description" : "When performed on multiple indices, allows to ignore `missing` ones"
        },
        "preference": {
          "type" : "string",
          "description" : "Specify the shards the operation should be performed on (default: random shard)"
        },
        "routing": {
          "type" : "string",
          "description" : "Specific routing value"
        },
        "source": {
          "type" : "string",
          "description" : "The URL-encoded request definition (instead of using request body)"
        }
      }
    },
    "body": {
      "description" : "The request definition"
    }
  }
}