Database
[{"_id":ObjectId("608d5b653979af6a8555f643"),"eMail":"ben@moskitofactory.com","billing":[{"company":"MoskitoFactory","salutation":"1","firstname":"Ben","lastname":"Water","address_line_1":"Black 1235","address_line_2":"","address_line_3":"","zip":"555","city":"Onecity"},{"company":"Witchcraft4U","salutation":"1","firstname":"Mike","lastname":"Phone","address_line_1":"Sea 4445","address_line_2":"","address_line_3":"","zip":"12345","city":"Somecity"}]}]
Query
db.collection.find({},{"billing":{$arrayElemAt:["$billing",0]}})