Retrieve only the value of an arrays sub-document field using MongoDB Java

I have a database:

{
"_id": {
    "$oid": "1"
},
"lastName": {
    "lastName": "James"
},
"data": [{
    "day": "20-09-2020 11:35:02",
    "hoursWorked": "0 hours : 5 mins : 321 secs"
}, {
    "day": "20-09-2020 11:35:29",
    "hoursWorked": "0 hours : 5 mins : 321 secs"
}]
}

How do I retrieve only the value of subfield "hoursWorked" of "data" field.
So, I need only the value or all values of such field, 0 hours : 5 mins : 321 secs.

I use the following; however, I still cannot retrieve the value.

Document document = collection
                .find(new BasicDBObject("_id", y))
                .projection(Projections.fields(Projections.include("data.hoursWorked"), excludeId())).first();
        System.out.println(document);
        }

Using MongoDB Java Driver:

List<Bson> pipeline = 
    Arrays.asList(
        project(
             fields(
                 excludeId(), 
                 computed("hoursWorked", 
                      eq("$reduce", 
                          and(eq("input", "$data"), eq("initialValue", Arrays.asList()),
                              eq("in", eq("$concatArrays", Arrays.asList("$$value", Arrays.asList("$$this.hoursWorked") ) ) ) 
                          ) 
                      ) 
                  ) 
              )
          ),
         unwind("$hoursWorked")
    );

collection.aggregate(pipeline)
             .into(new ArrayList<Document>())
             .forEach(doc -> System.out.println(doc.get("hoursWorked")));

Prints two values from the data array:

0 hours : 5 mins : 321 secs
0 hours : 5 mins : 322 secs

You can use projection $project.

db.collection.aggregate([
  {
    $project: {
      "data.hoursWorked": 1
    }
  }
])

Working Mongo playground

In spring boot, you need to autowire the mongoTemplate

@Autowired
MongoTemplate mongoTemplate;

The aggregation code,

public List<Object> test(){
	Aggregation aggregation = Aggregation.newAggregation(
		a-> new Document("$project",
				new Document("data.hoursWorked",1)
		)

	).withOptions(AggregationOptions.builder().allowDiskUse(Boolean.TRUE).build());

	return mongoTemplate.aggregate(aggregation, mongoTemplate.getCollectionName(YOUR_COLLECTION.class), Object.class).getMappedResults();
}

Update 1

Using Bson.Doument

Document nodes = (Document) collection
				.find(new BasicDBObject("_id", "1"))
				.projection(Projections.fields(Projections.include("data.hoursWorked"), Projections.excludeId()))
				.first();

		List<Document> list = (List<Document>) nodes.get("data");
		for(Document d:list){
			System.out.println(d.get("hoursWorked"));
		}