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Elastic Docs ›Elasticsearch Node.js client [5.x] ›Observability

Context object

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Context object

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Sometimes, you might need to make some custom data available in your events, you can do that via the context option of a request:

const { Client } = require('@elastic/elasticsearch')
const client = new Client({ node: 'http://localhost:9200' })

client.on('request', (err, result) => {
  const { id } = result.meta.request
  const { context } = result.meta
  if (err) {
    console.log({ error: err, reqId: id, context })
  }
})

client.on('response', (err, result) => {
  const { id } = result.meta.request
  const { winter } = result.meta.context
  if (err) {
    console.log({ error: err, reqId: id, winter })
  }
})

client.search({
  index: 'my-index',
  body: { foo: 'bar' }
}, {
  context: { winter: 'is coming' }
}, (err, result) => {
  if (err) console.log(err)
})
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