33 lines
1.3 KiB
Plaintext
33 lines
1.3 KiB
Plaintext
[[child]]
|
|
=== Creating a child client
|
|
|
|
There are some use cases where you may need multiple instances of the client.
|
|
You can easily do that by calling `new Client()` as many times as you need, but
|
|
you will lose all the benefits of using one single client, such as the long
|
|
living connections and the connection pool handling. To avoid this problem, the
|
|
client offers a `child` API, which returns a new client instance that shares the
|
|
connection pool with the parent client.
|
|
|
|
NOTE: The event emitter is shared between the parent and the child(ren). If you
|
|
extend the parent client, the child client will have the same extensions, while
|
|
if the child client adds an extension, the parent client will not be extended.
|
|
|
|
You can pass to the `child` every client option you would pass to a normal
|
|
client, but the connection pool specific options (`ssl`, `agent`, `pingTimeout`,
|
|
`Connection`, and `resurrectStrategy`).
|
|
|
|
CAUTION: If you call `close` in any of the parent/child clients, every client
|
|
will be closed.
|
|
|
|
[source,js]
|
|
----
|
|
const { Client } = require('@elastic/elasticsearch')
|
|
const client = new Client({ node: 'http://localhost:9200' })
|
|
const child = client.child({
|
|
headers: { 'x-foo': 'bar' },
|
|
requestTimeout: 1000
|
|
})
|
|
|
|
client.info().then(console.log, console.log)
|
|
child.info().then(console.log, console.log)
|
|
---- |