Setting up a new Elasticsearch cluster alongside your Elasticsearch cluster used in 8.0.x

You can use the Reindex API to migrate indices from the old Elasticsearch cluster to a new Elasticsearch cluster.

For more information, see Reindex from remote.

Procedure

Add the following configuration parameter to the elasticsearch.yml file of your new Elasticsearch cluster to enable it to access your old Elasticsearch cluster:
```
reindex.remote.whitelist: oldhost:*
```
Replace oldhost with the Elasticsearch host.
Do not specify the Elasticsearch port but set value to * or you may get the following error message: "[oldhost:9200] not whitelisted in reindex.remote.whitelist".
Restart the Elasticsearch cluster.

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