[{"_id":"doc1","content":[{"paragraph":"lorem"},{"paragraph":"lorem ipsum"}]},{"_id":"doc2","content":[{"paragraph":"lorem ipsum dolor"},{"paragraph":"lorem ipsum dolor sit"}]},{"_id":"doc0","content":[{"paragraph":"1st para"},{"paragraph":"2nd para"}]}]

db.collection.aggregate([{"$sort":{"_id":1}},{"$unwind":"$content"},{"$replaceWith":"$content"}])