All Mtas queries support sharding.
Example
Query simultaneously for the distribution of the word “de” on two cores
Request and response
q=*%3A*&mtas=true&mtas.stats=true&mtas.stats.spans=true&mtas.stats.spans.0.field=text&mtas.stats.spans.0.query.0.type=cql&mtas.stats.spans.0.query.0.value=[t%3D"de"]&mtas.stats.spans.0.key=example+-+sharding&mtas.stats.spans.0.type=distribution()&rows=0&wt=json&shards=localhost%3A8080%2Fsolr%2Fcore1%2F%2Clocalhost%3A8080%2Fsolr%2Fcore2%2F%2C&indent=true
"mtas":{ "stats":{ "spans":[{ "key":"example - sharding", "distribution()":{ "[0,1819]":2064420, "[1820,3639]":224, "[3640,5459]":103, "[5460,7279]":42, "[7280,9099]":10, "[9100,10919]":1, "[10920,12739]":3, "[12740,14559]":1, "[14560,16379]":2, "[16380,18199]":2}}]}}