Aggregation on view doesn't work when run with java driver, but works fine in shell.

sample code to reproduce the issue:

MongoClient client = new MongoClient("localhost", 27017);
SimpleMongoDbFactory factory = new SimpleMongoDbFactory(client, "databaseName");
MongoTemplate mongoTemplate = new MongoTemplate(factory);
List<DBObject> pipeline = new ArrayList<>();
BasicDBObject sort = new BasicDBObject("$sort", new BasicDBObject("_id", 1));
pipeline.add(sort);

AggregationOutput output = mongoTemplate.getCollection("viewCollection").aggregate(pipeline);
for (DBObject obj : output.results()) {
   String id = (String) obj.get("_id");
   System.out.println("ID IS " + id);
}

Error shows up with both Cursor and AggregationOutput

stack trace:

Exception in thread "main" org.bson.BsonInvalidOperationException: Document does not contain key result
at org.bson.BsonDocument.throwIfKeyAbsent(BsonDocument.java:844)
at org.bson.BsonDocument.getArray(BsonDocument.java:147)
at com.mongodb.operation.BsonDocumentWrapperHelper.toList(BsonDocumentWrapperHelper.java:28)
at com.mongodb.operation.AggregateOperation.createQueryResult(AggregateOperation.java:356)
at com.mongodb.operation.AggregateOperation.access$700(AggregateOperation.java:67)
at com.mongodb.operation.AggregateOperation$3.apply(AggregateOperation.java:367)
at com.mongodb.operation.AggregateOperation$3.apply(AggregateOperation.java:364)
at com.mongodb.operation.CommandOperationHelper.executeWrappedCommandProtocol(CommandOperationHelper.java:216)
at com.mongodb.operation.CommandOperationHelper.executeWrappedCommandProtocol(CommandOperationHelper.java:207)
at com.mongodb.operation.CommandOperationHelper.executeWrappedCommandProtocol(CommandOperationHelper.java:113)
at com.mongodb.operation.AggregateOperation$1.call(AggregateOperation.java:257)
at com.mongodb.operation.AggregateOperation$1.call(AggregateOperation.java:253)
at com.mongodb.operation.OperationHelper.withConnectionSource(OperationHelper.java:431)
at com.mongodb.operation.OperationHelper.withConnection(OperationHelper.java:404)
at com.mongodb.operation.AggregateOperation.execute(AggregateOperation.java:253)
at com.mongodb.operation.AggregateOperation.execute(AggregateOperation.java:67)
at com.mongodb.Mongo.execute(Mongo.java:836)
at com.mongodb.Mongo$2.execute(Mongo.java:823)
at com.mongodb.DBCollection.aggregate(DBCollection.java:1455)
at com.mongodb.DBCollection.aggregate(DBCollection.java:1380)
at com.mongodb.DBCollection.aggregate(DBCollection.java:1366)
at com.mycompany.test.Main.main(Main.java:200)