[{summaries:[{type:"humidity",min:10,max:40},{type:"temp",min:3,max:40}],thresholds:[{type:"temp",low:-10,high:40},{type:"humidity",low:9,high:30}]}]

db.collection.find({"$expr":{"$gt":[{"$arrayElemAt":["$summaries.min",{"$indexOfArray":["$summaries.min","temp"]}]},{"$arrayElemAt":["$thresholds.low",{"$indexOfArray":["$thresholds.type","temp"]}]}]}})