Transport

This class is responsible for performing the request to Elasticsearch and handling errors, it also handles sniffing.

 const { Client } = require('@elastic/elasticsearch') const { Transport } = require('@elastic/transport') class MyTransport extends Transport { request (params, options, callback) { // your code } } const client = new Client({ Transport: MyTransport })  

Sometimes you need to inject a small snippet of your code and then continue to use the usual client code. In such cases, call super.method:

 class MyTransport extends Transport { request (params, options, callback) { // your code return super.request(params, options, callback) } }  

Supported content types

Depending on the content-type of the response, the transport will return the body as different types:

Content-Type	JavaScript type
`application/json`	`object`
`text/plain`	`string`
`application/vnd.elasticsearch+json`	`object`
`application/vnd.mapbox-vector-tile`	`Buffer`
`application/vnd.apache.arrow.stream`	`Buffer`
`application/vnd.elasticsearch+arrow+stream`	`Buffer`
`application/smile`	`Buffer`
`application/vnd.elasticsearch+smile`	`Buffer`
`application/cbor`	`Buffer`
`application/vnd.elasticsearch+cbor`	`Buffer`