Получить вложенный список из mongoDB, используя функции агрегации весенней загрузки

Question

В настоящее время я работаю над приложением весенней загрузки с MongoDB, и у меня возникли некоторые проблемы, потому что я еще начинаю использовать функции агрегирования с Spring

Вот мои данные:

[
  {
"idGroupe": "5e186401219f320c77715eb9",
"groupName": "grp1",
"profilTwitters_ids": [
  {
    "idProfil": "5ded2abae1692808b799b239",
    "tweets": [
      {
        "idTweet": "5ded2dffe1692808b799b241",
        "datePublication": "2019-12-08T16:58:59.702+0000",
        "hashtags": [
          {
            "idHashtag": "5ded2c64e1692808b799b23c",
            "label": "recipes "
          },
          {
            "idHashtag": "5ded2c71e1692808b799b23d",
            "label": "delicious "
          },
          {
            "idHashtag": "5ded2c7ce1692808b799b23e",
            "label": "foodrecipes"
          },
          {
            "idHashtag": "5ded2c84e1692808b799b23f",
            "label": "canada "
          },
          {
            "idHashtag": "5ded2c8de1692808b799b240",
            "label": "Usa"
          },
          {
            "idHashtag": "5dee65d7e39e962d44a31c40",
            "label": "food"
          },
          {
            "idHashtag": "5dee65c8e39e962d44a31c3f",
            "label": "cooking"
          }
        ],
        "profileOwner": null
      },
      {
        "idTweet": "5dee97c7e87f7447c55faff7",
        "datePublication": "2019-12-09T18:51:51.688+0000",
        "hashtags": [
          {
            "idHashtag": "5ded2c64e1692808b799b23c",
            "label": "recipes "
          },
          {
            "idHashtag": "5ded2c71e1692808b799b23d",
            "label": "delicious "
          },
          {
            "idHashtag": "5ded2c7ce1692808b799b23e",
            "label": "foodrecipes"
          },
          {
            "idHashtag": "5ded2c84e1692808b799b23f",
            "label": "canada "
          },
          {
            "idHashtag": "5ded2c8de1692808b799b240",
            "label": "Usa"
          },
          {
            "idHashtag": "5dee65d7e39e962d44a31c40",
            "label": "food"
          },
          {
            "idHashtag": "5dee65c8e39e962d44a31c3f",
            "label": "cooking"
          }
        ],
        "profileOwner": null
      },
      {
        "idTweet": "5dee97d9e87f7447c55faff8",
        "datePublication": "2019-12-09T18:52:09.255+0000",
        "hashtags": [
          {
            "idHashtag": "5ded2c64e1692808b799b23c",
            "label": "recipes "
          },
          {
            "idHashtag": "5ded2c71e1692808b799b23d",
            "label": "delicious "
          },
          {
            "idHashtag": "5ded2c7ce1692808b799b23e",
            "label": "foodrecipes"
          },
          {
            "idHashtag": "5ded2c84e1692808b799b23f",
            "label": "canada "
          },
          {
            "idHashtag": "5ded2c8de1692808b799b240",
            "label": "Usa"
          },
          {
            "idHashtag": "5dee65d7e39e962d44a31c40",
            "label": "food"
          },
          {
            "idHashtag": "5dee65c8e39e962d44a31c3f",
            "label": "cooking"
          }
        ],
        "profileOwner": null
      },
      {
        "idTweet": "5dee97dae87f7447c55faff9",
        "datePublication": "2019-12-09T18:52:10.358+0000",
        "hashtags": [
          {
            "idHashtag": "5ded2c64e1692808b799b23c",
            "label": "recipes "
          },
          {
            "idHashtag": "5ded2c71e1692808b799b23d",
            "label": "delicious "
          },
          {
            "idHashtag": "5ded2c7ce1692808b799b23e",
            "label": "foodrecipes"
          },
          {
            "idHashtag": "5ded2c84e1692808b799b23f",
            "label": "canada "
          },
          {
            "idHashtag": "5ded2c8de1692808b799b240",
            "label": "Usa"
          },
          {
            "idHashtag": "5dee65d7e39e962d44a31c40",
            "label": "food"
          },
          {
            "idHashtag": "5dee65c8e39e962d44a31c3f",
            "label": "cooking"
          }
        ],
        "profileOwner": null
      },
      {
        "idTweet": "5dee97dbe87f7447c55faffa",
        "datePublication": "2019-12-09T18:52:11.370+0000",
        "hashtags": [
          {
            "idHashtag": "5ded2c64e1692808b799b23c",
            "label": "recipes "
          },
          {
            "idHashtag": "5ded2c71e1692808b799b23d",
            "label": "delicious "
          },
          {
            "idHashtag": "5ded2c7ce1692808b799b23e",
            "label": "foodrecipes"
          },
          {
            "idHashtag": "5ded2c84e1692808b799b23f",
            "label": "canada "
          },
          {
            "idHashtag": "5ded2c8de1692808b799b240",
            "label": "Usa"
          },
          {
            "idHashtag": "5dee65d7e39e962d44a31c40",
            "label": "food"
          },
          {
            "idHashtag": "5dee65c8e39e962d44a31c3f",
            "label": "cooking"
          }
        ],
        "profileOwner": null
      },
      {
        "idTweet": "5dee97dce87f7447c55faffb",
        "datePublication": "2019-12-09T18:52:12.265+0000",
        "hashtags": [
          {
            "idHashtag": "5ded2c64e1692808b799b23c",
            "label": "recipes "
          },
          {
            "idHashtag": "5ded2c71e1692808b799b23d",
            "label": "delicious "
          },
          {
            "idHashtag": "5ded2c7ce1692808b799b23e",
            "label": "foodrecipes"
          },
          {
            "idHashtag": "5ded2c84e1692808b799b23f",
            "label": "canada "
          },
          {
            "idHashtag": "5ded2c8de1692808b799b240",
            "label": "Usa"
          },
          {
            "idHashtag": "5dee65d7e39e962d44a31c40",
            "label": "food"
          },
          {
            "idHashtag": "5dee65c8e39e962d44a31c3f",
            "label": "cooking"
          }
        ],
        "profileOwner": null
      }
    ],
    "profileOwner": "5ded2a5de1692808b799b238",
    "groups_ids": null
  },
  {
    "idProfil": "5dee9e29f58af643b3ee27a3",
    "tweets": [
      {
        "idTweet": "5deea590f58af643b3ee27c3",
        "datePublication": "2019-12-09T19:50:40.841+0000",
        "hashtags": [
          {
            "idHashtag": "5dee9f8ef58af643b3ee27a8",
            "label": "Solutionneurs"
          },
          {
            "idHashtag": "5dee9f9df58af643b3ee27a9",
            "label": "Team237"
          },
          {
            "idHashtag": "5dee9fbff58af643b3ee27aa",
            "label": "Cmr"
          }
        ],
        "profileOwner": null
      },
      {
        "idTweet": "5deea5a9f58af643b3ee27c4",
        "datePublication": "2019-12-09T19:51:05.760+0000",
        "hashtags": [
          {
            "idHashtag": "5dee9f8ef58af643b3ee27a8",
            "label": "Solutionneurs"
          },
          {
            "idHashtag": "5dee9f9df58af643b3ee27a9",
            "label": "Team237"
          },
          {
            "idHashtag": "5dee9fbff58af643b3ee27aa",
            "label": "Cmr"
          }
        ],
        "profileOwner": null
      },
      {
        "idTweet": "5deea5aaf58af643b3ee27c5",
        "datePublication": "2019-12-09T19:51:06.355+0000",
        "hashtags": [
          {
            "idHashtag": "5dee9f8ef58af643b3ee27a8",
            "label": "Solutionneurs"
          },
          {
            "idHashtag": "5dee9f9df58af643b3ee27a9",
            "label": "Team237"
          },
          {
            "idHashtag": "5dee9fbff58af643b3ee27aa",
            "label": "Cmr"
          }
        ],
        "profileOwner": null
      },
      {
        "idTweet": "5deea5abf58af643b3ee27c6",
        "datePublication": "2019-12-09T19:51:07.284+0000",
        "hashtags": [
          {
            "idHashtag": "5dee9f8ef58af643b3ee27a8",
            "label": "Solutionneurs"
          },
          {
            "idHashtag": "5dee9f9df58af643b3ee27a9",
            "label": "Team237"
          },
          {
            "idHashtag": "5dee9fbff58af643b3ee27aa",
            "label": "Cmr"
          }
        ],
        "profileOwner": null
      },
      {
        "idTweet": "5deea5acf58af643b3ee27c7",
        "datePublication": "2019-12-09T19:51:08.772+0000",
        "hashtags": [
          {
            "idHashtag": "5dee9f8ef58af643b3ee27a8",
            "label": "Solutionneurs"
          },
          {
            "idHashtag": "5dee9f9df58af643b3ee27a9",
            "label": "Team237"
          },
          {
            "idHashtag": "5dee9fbff58af643b3ee27aa",
            "label": "Cmr"
          }
        ],
        "profileOwner": null
      }
    ],
    "profileOwner": "5dee9e59f58af643b3ee27a4",
    "groups_ids": null
  }
]
}
]

Я пытался получить список хэштегов и idProfil, используя эту функцию:

    public List<ResultHashtags> GetRecommendedHashtags(String idGroupe) {

    MatchOperation matchOperation=getMatchOperation(idGroupe);
    ProjectionOperation projectOperation = project("$profilTwitters_ids.tweets.hashtags");

    AggregationResults<ResultHashtags> result = 
    PMongoTemp.aggregate(Aggregation.newAggregation(matchOperation,projectOperation),
            Groupe.class, ResultHashtags.class);
       return result.getMappedResults();
    }

и это класс данных ответа:

package com.pds.sys_recommendation.entities;

 import java.util.List;

 public class ResultHashtags {

private List<Hashtag> tweets;

public List<Hashtag> getTweets() {
    return tweets;
}

public void setTweets(List<Hashtag> tweets) {
    this.tweets = tweets;
}
}