Cross cluster search with elastic search scalability tests / performance results

My question is with reference to elasticsearch's new feature 'cross cluster search'

Are there any performance tests/ studies available for this feature? How scalable is it?
One use case we have is, 10 clusters with 1 million documents each (total 10 mil across all clusters)
(need to support pagination, any column search, and sorting)
Is elastic search good fit for this scenario?

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