Transfer indices to new cluster

I put in place a new Elastic cluster v8.7 to replace an old one in v7.12.

In Elastic cluster v8.7, I started using Datastreams.

My question: what is the best way to transfer indices' data from old cluster to datastreams into the new one ?

Is it Cross-cluster replication APIs ?

Or Restoring snapshots ?

Is it also possible to send data in Datastreams ?

Thank you so much for your help.

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