This is an earlier version of the OpenSearch documentation. For the latest version, see the current documentation. For information about OpenSearch version maintenance, see Release Schedule and Maintenance Policy.
Using snapshots to migrate data
One popular approach is to take a snapshot of your Elasticsearch OSS 6.x or 7.x indices, create an OpenSearch cluster, restore the snapshot on the new cluster, and point your clients to the new host.
The snapshot approach can mean running two clusters in parallel, but lets you validate that the OpenSearch cluster is working in a way that meets your needs prior to modifying the Elasticsearch OSS cluster.