Reindexedit
The reindex API extracts the document source from the source index and indexes the documents into the destination index. You can copy all documents to the destination index, reindex a subset of the documents or update the source before to reindex it.
In the following example we have a game-of-thrones index which contains different quotes of various characters, we want to create a new index only for the house Stark and remove the house field from the document source.
'use strict'
const { Client } = require('@elastic/elasticsearch')
const client = new Client({ node: 'http://localhost:9200' })
async function run () {
await client.index({
index: 'game-of-thrones',
body: {
character: 'Ned Stark',
quote: 'Winter is coming.',
house: 'stark'
}
})
await client.index({
index: 'game-of-thrones',
body: {
character: 'Arya Stark',
quote: 'A girl is Arya Stark of Winterfell. And I\'m going home.',
house: 'stark'
}
})
await client.index({
index: 'game-of-thrones',
refresh: true,
body: {
character: 'Tyrion Lannister',
quote: 'A Lannister always pays his debts.',
house: 'lannister'
}
})
await client.reindex({
waitForCompletion: true,
refresh: true,
body: {
source: {
index: 'game-of-thrones',
query: {
match: { character: 'stark' }
}
},
dest: {
index: 'stark-index'
},
script: {
lang: 'painless',
source: 'ctx._source.remove("house")'
}
}
})
const { body } = await client.search({
index: 'stark-index',
body: {
query: { match_all: {} }
}
})
console.log(body.hits.hits)
}
run().catch(console.log)