Max_concurrent_shard_requests over cross cluster search 7.5 to 6.5

As you know In elasticsearch 7.x the max_concurrent_shard_requests concept change from over cluster (default 256) to per node (default 5). we want to use cross cluster search from 7.5 cluster to 6.5 cluster with max_concurrent_shard_requests=1 and we concern about this limit apply as cluster max_concurrent_shard_requests limit in 6.5 cluster.
can anyone from elasticsearch team member clarify about this config?


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