如何计算elasticsearch中嵌套字段下的文档数量

Question

我是elasticsearch的新手，刚开始尝试利用elasticsearch在nodejs上进行全文搜索。目前我有一个问题，找出计数嵌套字段的项目数。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user1或user2有多少部电影？（在这种情况下为2和4）。

如果结果令人惊讶地困难，我仍然可以回退到将该号码存储在其他地方。

Answer 1

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}`);