Is there any solution for Index federation?

Our Elasticsearch Nodes are more then 2000. we create some clusters for different use case.
As search federation solution can use the Cross-cluster search. Is there any solution for Index federation?
I think Tribe Node solution is so heavy As It will add in all clusters and is version related.

Depends what version you are on.

We have released cross cluster replication in 7.0.

CCR is the cluster replication solution. As we want to make some ES clusters as a federation, that users think as a big cluster,Is there any solution?

Not that I know of.

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