It's not exactly what I want (I think); The purpose of indexer clustering is, as far as I'm aware, to have two or more indexers with the exact same data. Multi site indexer clustering would be the same but you have multiple sites with the exact same indexers/data.
I can't see that there's any way to use this mechanism for anything but data redundancy/performance benefits, e.g. you always replicate the whole environment or nothing at all.
What I'm after is to be able to choose an index (Call it "index1") in one environment ("site1") and replicate that index between the two sites ("site1" and "site2").
So "site1" would have a totally different data set than "site2" EXCEPT for "index1", which they would share and both have identical copies of.
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