Cross cluster search

we have more than 20 elasticsearch cluster and we are planning to use cross cluster search for searching the data across all the cluster.
could you please let me know that is there any limitation for adding remote clusters ?
what is the max number remote clusters that we can add ?

AFAIK there is no limitation son the number of clusters
May be at the master cluster with clients nodes need some ressources to aggregates all remotes searches and present them to the client

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There's no technical limit that I am aware of.
You might run into a practical one, depending on how large your clusters are.

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