[docs] Migrate docs from AsciiDoc to Markdown (#2635)

* delete asciidoc files * add migrated files * Apply suggestions from review Co-authored-by: Josh Mock <josh@joshmock.com> * Apply suggestions from review Co-authored-by: Josh Mock <josh@joshmock.com> * add the new ci checks (#2634) --------- Co-authored-by: Marci W <333176+marciw@users.noreply.github.com> Co-authored-by: Josh Mock <josh@joshmock.com>
2025-02-27 11:51:14 -06:00
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--- a/docs/reference/reindex_examples.md
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+---
+mapped_pages:
+  - https://www.elastic.co/guide/en/elasticsearch/client/javascript-api/current/reindex_examples.html
+---
+
+# Reindex [reindex_examples]
+
+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.
+
+```js
+'use strict'
+
+const { Client } = require('@elastic/elasticsearch')
+const client = new Client({
+  cloud: { id: '<cloud-id>' },
+  auth: { apiKey: 'base64EncodedKey' }
+})
+
+async function run () {
+  await client.index({
+    index: 'game-of-thrones',
+    document: {
+      character: 'Ned Stark',
+      quote: 'Winter is coming.',
+      house: 'stark'
+    }
+  })
+
+  await client.index({
+    index: 'game-of-thrones',
+    document: {
+      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,
+    document: {
+      character: 'Tyrion Lannister',
+      quote: 'A Lannister always pays his debts.',
+      house: 'lannister'
+    }
+  })
+
+  await client.reindex({
+    wait_for_completion: true,
+    refresh: true,
+    source: {
+      index: 'game-of-thrones',
+      query: {
+        match: { house: 'stark' }
+      }
+    },
+    dest: {
+      index: 'stark-index'
+     },
+    script: {
+      lang: 'painless',
+      source: 'ctx._source.remove("house")'
+    }
+  })
+
+  const result = await client.search({
+    index: 'stark-index',
+    query: { match_all: {} }
+  })
+
+  console.log(result.hits.hits)
+}
+
+run().catch(console.log)
+```
+