[[transport-reference]]
== Transport

=== request(params, [callback])

==== Params
[horizontal]
`method`::
`String` -- The HTTP method to use for this request. All of the API methods have their own default.

`path`::
`String` -- The path/endpoint for the request

`query`::
`String|Object` -- The query string params

`body`::
`String|Object|Array<Object>` -- The request body to be sent to elasticsearch

`requestTimeout`::
`Number` -- The number of milliseconds before this request should "timeout"

`headers`::
`Object<String:String>` -- An object of string keys and values to use as the headers for this request.

`ignore`::
`Number, Number[]` -- HTTP status codes which should not be treated as errors

`requestTimeout`::
`Number` -- Milliseconds this request has to complete. The default can be set using the client's `requestTimeout:` config parameter.

`castExists`::
`Boolean` -- This is used by methods like `indices.exists()` to provide a `true`/`false` return value based on the status of the response. When set to `true` 200 responses are converted to `true`, and 404s to `false`. Any other error will still be passed through to the response handler but all other response data is discarded.

`bulkBody`::
`Boolean` -- Set to `true` if the body should be formatted using the newline delimited JSON format used by the `bulk` API.


=== setHosts(hostConfigs)

Use this method to dynamically change the list or hosts the client uses.

==== args
[horizontal]
`hostConfigs`::
`Array<HostConfig>` -- any valid host config value, as accepted by the client constructor. Each value can be either a url string, an object describing the values detailed in the host[host] docs, or an instance of the `Host` class.