From MongoDB Compass --> Open MongoDB shell: db.MY_ COLLECTION_NAME .updateMany({}, [   {$replaceWith: {     $mergeObjects: [       {         "_id": "$_id",         "field1": "$field1",         "field2": "$field2"       },       "$$ROOT"     ]   }}]) Specify the fields in the block in the order you want them. Note this works with arrays and all data types.