135 lines
3.2 KiB
Plaintext
135 lines
3.2 KiB
Plaintext
[[introduction]]
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== Introduction
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This is the official Node.js client for {es}. This page gives a quick overview
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about the features of the client.
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[discrete]
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=== Features
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* One-to-one mapping with REST API.
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* Generalized, pluggable architecture.
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* Configurable, automatic discovery of cluster nodes.
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* Persistent, Keep-Alive connections.
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* Load balancing across all available nodes.
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* Child client support.
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* TypeScript support out of the box.
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[discrete]
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=== Quick start
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[source,js]
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----
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'use strict'
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const { Client } = require('@elastic/elasticsearch')
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const client = new Client({ node: 'http://localhost:9200' })
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async function run () {
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// Let's start by indexing some data
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await client.index({
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index: 'game-of-thrones',
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document: {
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character: 'Ned Stark',
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quote: 'Winter is coming.'
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}
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})
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await client.index({
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index: 'game-of-thrones',
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document: {
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character: 'Daenerys Targaryen',
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quote: 'I am the blood of the dragon.'
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}
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})
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await client.index({
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index: 'game-of-thrones',
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document: {
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character: 'Tyrion Lannister',
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quote: 'A mind needs books like a sword needs a whetstone.'
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}
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})
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// here we are forcing an index refresh, otherwise we will not
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// get any result in the consequent search
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await client.indices.refresh({ index: 'game-of-thrones' })
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// Let's search!
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const result= await client.search({
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index: 'game-of-thrones',
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query: {
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match: { quote: 'winter' }
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}
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})
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console.log(result.hits.hits)
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}
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run().catch(console.log)
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----
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TIP: For an elaborate example of how to ingest data into Elastic Cloud,
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refer to {cloud}/ec-getting-started-node-js.html[this page].
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[discrete]
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==== Install multiple versions
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If you are using multiple versions of {es}, you need to use multiple versions of
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the client as well. In the past, installing multiple versions of the same
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package was not possible, but with `npm v6.9`, you can do it via aliasing.
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To install different version of the client, run the following command:
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[source,sh]
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----
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npm install <alias>@npm:@elastic/elasticsearch@<version>
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----
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For example, if you need to install `7.x` and `6.x`, run the following commands:
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[source,sh]
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----
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npm install es6@npm:@elastic/elasticsearch@6
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npm install es7@npm:@elastic/elasticsearch@7
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----
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Your `package.json` will look similar to the following example:
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[source,json]
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----
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"dependencies": {
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"es6": "npm:@elastic/elasticsearch@^6.7.0",
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"es7": "npm:@elastic/elasticsearch@^7.0.0"
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}
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----
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Require the packages from your code by using the alias you have defined.
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[source,js]
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----
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const { Client: Client6 } = require('es6')
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const { Client: Client7 } = require('es7')
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const client6 = new Client6({ node: 'http://localhost:9200' })
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const client7 = new Client7({ node: 'http://localhost:9201' })
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client6.info().then(console.log, console.log)
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client7.info().then(console.log, console.log)
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----
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Finally, if you want to install the client for the next version of {es} (the one
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that lives in the {es} main branch), use the following command:
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[source,sh]
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----
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npm install esmain@github:elastic/elasticsearch-js
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----
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WARNING: This command installs the main branch of the client which is not
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considered stable. |