Elasticsearch with the JavaScript client

Uses @elastic/elasticsearch 9.5. The code is an ordinary application for the original database; nothing in it knows about MachNoSQL.

The only change

https://es.example.com:9200
https://machnosql.example.com:9200

The address comes from the environment variable ELASTICSEARCH_URL, so switching to MachNoSQL changes configuration only.

Run

export ELASTICSEARCH_URL='https://machnosql.example.com:9200'
npm install
npm start

Credentials come from ELASTICSEARCH_USERNAME and ELASTICSEARCH_PASSWORD.

Source

The program as it is kept and tested in the Mach Database NoSQL repository; highlighted lines read the connection setting.

app.js

// Product search on Elasticsearch, unchanged on MachNoSQL.
import { Client } from "@elastic/elasticsearch";

const client = new Client({
  node: process.env.ELASTICSEARCH_URL,
  auth: { username: process.env.ELASTICSEARCH_USERNAME, password: process.env.ELASTICSEARCH_PASSWORD },
});

if (!(await client.indices.exists({ index: "products" }))) {
  await client.indices.create({
    index: "products",
    mappings: { properties: { name: { type: "text" }, brand: { type: "keyword" }, price: { type: "float" } } },
  });
}

await client.helpers.bulk({
  datasource: [
    { id: "1", name: "mechanical keyboard", brand: "keyco", price: 89.0 },
    { id: "2", name: "wireless keyboard", brand: "typer", price: 49.0 },
    { id: "3", name: "gaming mouse", brand: "keyco", price: 39.0 },
  ],
  onDocument: ({ id }) => ({ index: { _index: "products", _id: id } }),
});
await client.indices.refresh({ index: "products" });

const found = await client.search({ index: "products", query: { match: { name: "keyboard" } } });
for (const hit of found.hits.hits) {
  console.log(hit._score, hit._source.name);
}

const brands = await client.search({ index: "products", size: 0, aggs: { brands: { terms: { field: "brand" } } } });
console.log(brands.aggregations.brands.buckets);

package.json

{
  "name": "machnosql-example-elasticsearch-node",
  "private": true,
  "type": "module",
  "scripts": { "start": "node app.js" },
  "dependencies": { "@elastic/elasticsearch": "^9.5.1" }
}