What kind of issues are there in 2 node ES Master-Master Cluster Set Up?

In one of my post i asked about measuring replication lag while replicating data among master and data nodes ,so I got to know it is done synchronously and there is no lag as such. So is there any issue if I set up master - master set up?
Or what are the advantages of setting master and data node cluster over master master cluster or vice versa?

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