Node.js 如何计算elasticsearch中嵌套字段下的文档数

我是elasticsearch新手，刚刚开始尝试利用elasticsearch在nodejs上进行全文搜索。目前，我在计算嵌套字段的项数时遇到了一个问题。例如，假设这是我的数据：

{
  user1: {
    movies: [
      {
        title: 'eat'
      },
      {
        title: 'drink'
      }
    ],
    books: [
      {
        author: 'apple'
      }
    ]
  },
  user2: {
    movies: [
      {
        title: 'jump'
      },
      {
        title: 'punch'
      },
      {
        title: 'sleep'
      },
      {
        title: 'eat'
      }
    ],
    books: [
      {
        author: 'orange'
      }
    ]
  }
}

如何简单计算用户1或用户2有多少部电影？（本例中为2和4）

如果结果是出乎意料的困难，我仍然可以回过头来把这个数字存储到其他地方

let users = {
        user1: {
                movies: [
                        {
                                title: 'eat'
                        },
                        {
                                title: 'drink'
                        }
                ],
                books: [
                        {
                                author: 'apple'
                        }
                ]
        },
        user2: {
                movies: [
                        {
                                title: 'jump'
                        },
                        {
                                title: 'punch'
                        },
                        {
                                title: 'sleep'
                        },
                        {
                                title: 'eat'
                        }
                ],
                books: [
                        {
                                author: 'orange'
                        }
                ]
        }
}

console.log(`User1 count: ${users.user1.movies.length}`);
console.log(`User2 count: ${users.user2.movies.length}`);