bucket-with-options

B.java

BucketOptions o=new BucketOptions();

o.output(
        new BsonField("student_ids", new Document("$push","$student_id")),
        new BsonField("attended_class",new Document("$sum",
                new Document("$cond",
                        Arrays.asList(
                                new Document("$gte",Arrays.asList("$attn",8)),
                                1,
                                0
                        )
                )
        )
        ),
        new BsonField("students_total", new Document("$sum",1))
);
        
Bson b=Aggregates.bucket("$final_grade", Arrays.asList(0,45,55,70,85,100),o);