db={"Ship_Data":[{_id:ObjectId("63d19d7a1991a09011aa35ef"),sourcemmsi:228051000,navigationalstatus:0,course:{rateofturn:-127,speedoverground:0,courseoverground:291.5,trueheading:511},coordinates:{longitude:-4.4850965,latitude:48.38132,timestamp:1443650424}}],"SourceMMSI":[{_id:ObjectId("63d19f671991a09011e4eba4"),mmsi_code:228,country:"France"}]}

db.SourceMMSI.aggregate([{"$lookup":{"from":"Ship_Data","let":{code:{"$toString":"$mmsi_code"}},"pipeline":[{$match:{$expr:{$eq:[0,{"$indexOfCP":[{$toString:{$toLong:"$sourcemmsi"}},"$$code"]}]}}}],"as":"shipDataLookup"}}])