Clone an Elasticsearch Index

It’s not hard, but no one ever seems to explicitly write this down.

1. Create the destination index with the same settings.

• Grab the index config from somehost:9200/someindex
• Pare out unwanted index config, eg: source name, uuid, creation date
• Cram the config into a new index

curl -XPUT 'http://localhost:9200/someindex_copy' \
  -H 'Content-Type: application/json' \
  -d "$(curl http://localhost:9200/someindex | jq '.someindex | del(.settings.index.provided_name, .settings.index.creation_date, .settings.index.uuid, .settings.index.version)')"

2. Call the Reindex API

curl -X POST "localhost:9200/_reindex?pretty" -H 'Content-Type: application/json' -d'
{
  "source": {
    "index": "someindex"
  },
  "dest": {
    "index": "someindex_copy"
  }
}
'

There’s all sorts of good stuff that the Reindex API can do, like reindex from remote, filtering, transforms, etc.

Docs: https://www.elastic.co/guide/en/elasticsearch/reference/7.5/docs-reindex.html

3. That’s It.

That’s the bones of it. Fill your boots.

Photo by Bimata Prathama on Unsplash