elasticsearch-js/docs/reference/transport.md

mapped_pages

mapped_pages
https://www.elastic.co/guide/en/elasticsearch/client/javascript-api/current/transport.html

Transport [transport]

This class is responsible for performing the request to {{es}} 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 [_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