[{"_id":ObjectId("62aeb8301ed12a14a8873df1"),"Fields":[{"FieldId":"e8efd0b0-9d10-4584-bb11-5b24f189c03b","Value":["test_123"]},{"FieldId":"fa6745c2-b259-4a3b-8c6f-19eb78fbbbf5","Value":["123"]},{"FieldId":"2a1be5d0-8fb6-4b06-a253-55337bfe4bcd","Value":[]},{"FieldId":"eed12747-0923-4290-b09c-5a05107f5609","Value":["234234234"]},{"FieldId":"fe41d8fb-fa18-4fe5-b047-854403aa4d84","Value":["Irrelevan"]},{"FieldId":"93e46476-bf2e-44eb-ac73-134403220e9e","Value":["test"]},{"FieldId":"db434aca-8df3-4caf-bdd7-3ec23252c2c8","Value":["2019-06-16T18:30:00.000Z"]},{"FieldId":"00df903f-5d59-41c1-a3df-60eeafb77d10","Value":["tewt"]},{"FieldId":"e97d0386-cd42-6277-1207-e674c3268cec","Value":["1"]},{"FieldId":"35e55d27-7d2c-467d-8a88-09ad6c9f5631","Value":["10"]}]}]

db.collection.aggregate([{$replaceWith:{$mergeObjects:[{_id:"$_id"},{$arrayToObject:{$zip:{inputs:["$Fields.FieldId","$Fields.Value"]}}}]}}])