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Prerequisites

To complete this tutorial, you need:

The manage cluster privilege on the local cluster.
A license on both clusters that includes cross-cluster replication. Activate a free 30-day trial.
An index on the remote cluster that contains the data you want to replicate. This tutorial uses the sample eCommerce orders data set. Load sample data.
In the local cluster, all nodes with the master node role must also have the remote_cluster_client role. The local cluster must also have at least one node with both a data role and the remote_cluster_client role. Individual tasks for coordinating replication scale based on the number of data nodes with the remote_cluster_client role in the local cluster.

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https://www.elastic.co/guide/en/elasticsearch/reference/8.17/ccr-getting-started-prerequisites.html