Limit on number of Clusters supported by Cross cluster search (CCS)

Can I have a Architectural design where in we have around 100 clusters of Elastic.
Where in each cluster is basically a small set of Master Node and Data Nodes .
Using Cross Cluster Search if we send the search queries to a Cluster and let the query propagate from that cluster to other clusters for search result.
Is there a maximum number or a recommended number of Clusters which CCS supports ?
Does the CCS performance goes down with the increase of number of clusters beyond a certain threshold ?

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