elasticsearch - ElasticSearch-包含文档详细信息的聚合

Question

我需要汇总以下文档:

{
    "title": "American Psycho",
    "releaseDate": "7/06/2000",
    "imdbRate": "7.6",
    "casting": [
        {
            "name": "Christian Bale",
            "category": "Actor"
        },
        {
            "name": "Justin Theroux",
            "category": "Actor"
        }
    ]
}

{
    "title": "The Dark Knight",
    "releaseDate": "13/08/2008",
    "imdbRate": "9.0",
    "casting": [
        {
            "name": "Christian Bale",
            "category": "Actor"
        },
        {
            "name": "Morgan Freeman",
            "category": "Actor"
        }
    ]
}

由 Actor 组成，并希望获得以下结构:

 [
    {"name": "Christian Bale"},
    {"movies": [
        {
            "title": "American Psycho",
            "releaseDate": "7/06/2000",
            "imdbRate": "7.6"
        },
        {
            "title": "The Dark Knight",
            "releaseDate": "13/08/2008",
            "imdbRate": "9.0"
        }, ...
]

Beyong使用基于Cast.name字段的标准术语聚合，如何检索相关文档的releaseDate和imdbRate？
对于每个 Actor ，我还需要按照releaseDate asc对电影进行排序。

我可以使用一个请求执行此操作吗？

Answer 1

由于文档中包含casting对象数组，因此需要在映射中使用嵌套类型。要获得所需的聚合，需要结合使用Terms Aggregations，Nested Aggregations和Reverse Nested Aggregations。下面是一个例子。

使用映射创建并建立索引:

POST /test
{
    "mappings": {
        "movie": {
            "properties": {
                "title": {
                    "type": "string",
                    "fields": {
                        "raw": {
                            "type": "string",
                            "index": "not_analyzed"
                        }
                    }
                },
                "releaseDate": {
                    "type": "string",
                     "index": "not_analyzed"
                },
                "casting": {
                    "type": "nested",
                    "properties": {
                        "name": {
                            "type": "string",
                            "fields":{
                            "raw": {
                                "type": "string",
                                "index": "not_analyzed"
                            }
                            }
                        },
                        "category": {
                            "type": "string",
                            "fields":{
                                "raw": {
                                    "type": "string",
                                    "index": "not_analyzed"
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}

索引文件:

POST /test/movie/1
{
    "title": "American Psycho",
    "releaseDate": "7/06/2000",
    "imdbRate": "7.6",
    "casting": [
        {
            "name": "Christian Bale",
            "category": "Actor"
        },
        {
            "name": "Justin Theroux",
            "category": "Actor"
        }
    ]
}

POST /test/movie/2
{
    "title": "The Dark Knight",
    "releaseDate": "13/08/2008",
    "imdbRate": "9.0",
    "casting": [
        {
            "name": "Christian Bale",
            "category": "Actor"
        },
        {
            "name": "Morgan Freeman",
            "category": "Actor"
        }
    ]
}

最后搜索:

POST /test/movie/_search?search_type=count
{
    "aggs": {
        "nested_path": {
            "nested": {
                "path": "casting"
            },
            "aggs": {
                "actor_name": {
                    "terms": {
                        "field": "casting.name.raw"
                    },
                    "aggs": {
                        "movies": {
                            "reverse_nested": {},
                            "aggs": {
                                "movie_title": {
                                    "terms": {
                                        "field": "title.raw"
                                    },
                                    "aggs": {
                                        "release_date": {
                                            "terms": {
                                                "field": "releaseDate"
                                            }
                                        },
                                        "imdbRate_date": {
                                            "terms": {
                                                "field": "imdbRate"
                                            }
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}

Christian Bale的回应是:

{
    "key": "Christian Bale",
    "doc_count": 2,
    "movies": {
        "doc_count": 2,
        "movie_title": {
            "doc_count_error_upper_bound": 0,
            "sum_other_doc_count": 0,
            "buckets": [
                {
                    "key": "American Psycho",
                    "doc_count": 1,
                    "release_date": {
                        "doc_count_error_upper_bound": 0,
                        "sum_other_doc_count": 0,
                        "buckets": [
                            {
                                "key": "7/06/2000",
                                "doc_count": 1
                            }
                        ]
                    },
                    "imdbRate_date": {
                        "doc_count_error_upper_bound": 0,
                        "sum_other_doc_count": 0,
                        "buckets": [
                            {
                                "key": "7.6",
                                "doc_count": 1
                            }
                        ]
                    }
                },
                {
                    "key": "The Dark Knight",
                    "doc_count": 1,
                    "release_date": {
                        "doc_count_error_upper_bound": 0,
                        "sum_other_doc_count": 0,
                        "buckets": [
                            {
                                "key": "13/08/2008",
                                "doc_count": 1
                            }
                        ]
                    },
                    "imdbRate_date": {
                        "doc_count_error_upper_bound": 0,
                        "sum_other_doc_count": 0,
                        "buckets": [
                            {
                                "key": "9.0",
                                "doc_count": 1
                            }
                        ]
                    }
                }
            ]
        }
    }
}