[{"_id":ObjectId("628be38c81f6e31196b6148b"),"items":[{"shape":"circle","color":"blue"},{"shape":"square","color":"red"},{"shape":"triangle","color":"yellow"}]}]

db.collection.aggregate([{$match:{"items.shape":"circle"}},{$set:{items:{$first:{"$filter":{"input":"$items","as":"i","cond":{$eq:["$$i.shape","circle"]}}}}}},{"$replaceRoot":{newRoot:"$items"}}])