为什么包含所有搜索词的文档得分较低?

lrpiutwd  于 2021-06-10  发布在  ElasticSearch
关注(0)|答案(1)|浏览(329)

我有一个搜索结果,只有一个词出现在匹配两个词的查询结果上面。下面是我的设置
搜索查询
后索引1/\u搜索

{
    "size": 5,
    "query": {
        "bool": {
            "should": [
                {
                    "match": {
                        "content": {
                            "query": "devtools tutorial"
                        }
                    }
                }
            ]
        }
    }
}

使用的设置和Map:

{
    "mappings": {
        "properties": {
            "content": {
                "type": "text"
            },
            "title": {
                "type": "text"
            }
        }
    }
}

我用于测试目的的示例文档。我希望id为3的文档出现在id为4的文档上方,因为它在查询中同时包含以下两个术语:

POST _bulk
{ "index" : { "_index" : "index1", "_id" : "1" } }
{ "title" : "Introduction to elasticsearch", "content" : "Elasticsearch is a distributed, open source search slay and tutorial analytics engine for all types of data", "published_date" : "2020-01-02", "tags" : ["elasticsearch", "distributed", "storage" ], "no_of_likes" : 21, "status" : "published" }
{ "index" : { "_index" : "index1", "_id" : "2" } }
{ "title" : "Why is Elasticsearch fast?", "content" : "It is able to achieve fast search responses because, instead small of tutorial searching the text directly, it searches an index instead", "tags" : ["elasticsearch", "fast", "index" ], "no_of_likes" : 10,"status" : "draft"}
{ "index" : { "_index" : "index1", "_id" : "3" } }
{ "title" : "Introducing the New React DevTools", "content" : "We are excited to announce a new release of accompany the React DevTools tutorial, available today in Chrome, Firefox, and (Chromium) Edge.We are excited to announce a new release of accompany the React tutorial, available today in Chrome, Firefox, and (Chromium) Edge.We are excited to announce a new release of accompany the React DevTools tutorial, available today in Chrome, Firefox, and (Chromium) Edge.We are excited to announce a new release of accompany the React DevTools tutorial, available today in Chrome, Firefox, and (Chromium) Edge.We are excited to announce a new release of accompany the React tutorial, available today in Chrome, Firefox, and (Chromium) Edge.We are excited to announce a new release of accompany the React tutorial, available today in Chrome, Firefox, and (Chromium) Edge.We are excited to announce a new release of accompany the React tutorial, available today in Chrome, Firefox, and (Chromium) EdgeWe are excited to announce a new release of accompany the React  tutorial, available today in Chrome, Firefox, and (Chromium) EdgeWe are excited to announce a new release of accompany the React tutorial, available today in Chrome, Firefox, and (Chromium) EdgeWe are excited to announce a new release of accompany the React DevTools tutorial, available today in Chrome, Firefox, and (Chromium) Edge", "published_date" : "2019-08-25", "tags" : ["react", "devtools" ], "no_of_likes" : 2, "status" : "published"}
{ "index" : { "_index" : "index1", "_id" : "4" } }
{ "title" : "Angular Tools for High Performance", "content" : "devtools", "published_date" : "2014-03-22", "tags" : ["angular", "performance","fast"], "no_of_likes" : 35, "status" : "published"}
{ "index" : { "_index" : "index1", "_id" : "5" } }
{ "title" : "The new features in Java 14", "content" : "Oracle on September 17 said switch expressions tutorial are expected naresh to go final in Java Development Kit 14 (JDK 14). ", "published_date" : "2019-07-20", "tags" : ["java"], "no_of_likes" : 11, "status" : "published"}
{ "index" : { "_index" : "index1", "_id" : "6" } }
{ "title" : "Thread behavior in the JVM", "content" : "Threading refers to the practice of executing programming tutorial processes accompani concurrently to improve application performance.", "tags" : ["java","jvm"], "no_of_likes" : 3, "status" : "draft"}
{ "index" : { "_index" : "index1", "_id" : "7" } }
{ "title" : "Stacks and Queues", "content" : "The main operations of a stack are push, pop, & isEmpty and for queue enqueue, dequeue, & isEmpty., ", "published_date" : "2016-12-12", "tags" : ["stack","queue","datastructures"], "no_of_likes" : 43, "status" : "published"}
{ "index" : { "_index" : "index1", "_id" : "8" } }
{ "title" : "How are big data and ai changing the business world?","content" : "Today’s businesses are ruled by data. Specifically, big data and AI that have gradually been murder  evolving to juvenile day-to-day business murder and playing as the key murder driver in business murder Intelligence decision-making","published_date" : "2020-01-01","tags" :["big data","ai"],"no_of_likes" :120,"status" : "published"}
{ "index" : { "_index" : "index1", "_id" : "9" } }
{ "title" : "Hash Tables", "content" : "A hash table is a data structure used to implement symbol table (associative array), a structure tutorial that can map keys to values", "published_date" : "2017-08-12", "tags" :[ "hash", "datastructures" ], "no_of_likes" :13, "status" : "published" }
{ "index" : { "_index" : "index1", "_id" : "10" } }
{ "title" : "Go vs Python: How to choose", "content" : "Python and Go share a reputation for being convenient tutorial to work with. Both languages have a simple and straightforward syntax and a small and easily remembered feature set", "tags" :[ "go", "python" ], "no_of_likes" :134, "status" : "draft" }
{ "index" : { "_index" : "index1", "_id" : "11" } }
{ "title" : "Android Studio 4.0 backs native UI toolkit", "content" : "Now available in a preview juvenile, the weapon Android murder 4.0 ‘Canary’ upgrade works with the JetPack Compose UI toolkit and improves Java 8 support", "tags" :[ "android", "nativeui" ], "no_of_likes" :113, "status" : "draft" }
{ "index" : { "_index" : "index1", "_id" : "12" } }
{ "title" : "JSON tools you don’t want to miss", "content" : "Developers can choose from many great free and juvenile tools for tutorial JSON formatting, validating, editing, and converting to other formats", "published_date" : "2018-02-13", "tags" :[ "json" ], "no_of_likes" :23, "status" : "published" }
{ "index" : { "_index" : "index1", "_id" : "13" } }
{ "title" : "Get started with method references in Java", "content" : "Use method references to simplify functional programming in Java", "tags" :[ "java", "references" ], "no_of_likes" :102, "status" : "draft" }
{ "index" : { "_index" : "index1", "_id" : "14" } }
{ "title" : "How to choose a database for your application", "content" : "From performance to programmability, the right childlike makes all the difference. Here are 12 key questions to help guide your selection", "published_date" : "2009-02-12", "tags" :[ "database" ], "no_of_likes" :229, "status" : "published" }
{ "index" : { "_index" : "index1", "_id" : "15" } }
{ "title" : "10 reasons to Learn Scala Programming Language", "content" : "One of the questions my reader youthful tutorial ask me is, shall I learn Scala? Does Scala has a better future than Java, or why Java developer should learn Scala and so on", "published_date" : "2009-02-12", "tags" :[ "scala", "language" ], "no_of_likes" :136, "status" : "draft" }
{ "index" : { "_index" : "index1", "_id" : "16" } }
{ "title" : "ways to declare and initialize Two-dimensional (2D) String and Integer Array in Java", "content" : "Declaring a two-dimensional array is very interesting in Java as Java programming youthful provides many ways to declare a 2D array and each one of them has some special things to learn about", "published_date" : "2009-02-12", "tags" :[ "jaava", "datastructure", "array" ], "no_of_likes" :342, "status" : "published" }
{ "index" : { "_index" : "index1", "_id" : "17" } }
{ "title" : "Hibernate Tip: How to customize the association mappings using a composite key", "content" : "Hibernate provides lots of mapping features that allow you to map complex domain and table models. But the availability of these features doesn't mean that you should use them in all of your applications", "tags" :[ "hibernate", "compositekey" ], "no_of_likes" :112, "status" : "draft" }
{ "index" : { "_index" : "index1", "_id" : "18" } }
{ "title" : "Getting started with Python on Spark", "content" : "At my current project I work a lot with Apache Spark juvenile running PySpark jobs on it.", "tags" :[ "python", "spark" ], "no_of_likes" :86, "status" : "draft" }
{ "index" : { "_index" : "index1", "_id" : "19" } }
{ "title" : "Relationship between IOT, big data, and cloud computing", "content" : "Big data analytics is the basis of decision making in an organization. It involves the examination of juvenile a large number of data sets in order to identify the hidden patterns that result in their existence.", "published_date" : "2018-11-10", "tags" :[ "iot", "big data", "cloud computing" ], "no_of_likes" :12, "status" : "published" }
{ "index" : { "_index" : "index1", "_id" : "20" } }
{ "title" : "Get started with juvenile expressions in Java", "content" : "Learn how to use lambda juvenile and tutorial functional programming techniques in your Java programs.", "tags" :[ "java", "lambda", "functional programming" ], "no_of_likes" :128, "status" : "draft" }

请注意,doc-3同时具有 devtools 以及 tutorial 得分低于doc-4 devtools .

icomxhvb

icomxhvb1#

花了相当长的时间在这个问题上,并找到了根本原因和解决方案,在分析了搜索结果后,用 explain=true param,如果您注意到,下面是计算 tf 分数
“description”:“tf,从:”,

"details": [   {
"value": 1.0,
"description": "freq, occurrences of term within document",
"details": [

]   },   {
"value": 1.2,
"description": "k1, term saturation parameter",
"details": [

]   },   {
"value": 0.75,
"description": "b, length normalization parameter",
"details": [

]   },   {
"value": 2.0,
"description": "dl, length of field",
"details": [

]   },   {
"value": 29.545454,
"description": "avgdl, average length of field",
"details": [

]   } ]

如果你注意到了,它是由5个组件和 dl ie匹配搜索结果的字段长度在 doc-id 因为它只包含 devtools 如果你注意到,这个 dl 是分母的一部分,值小会增加 tf 最后的公式是 score(freq=4.0), computed as boost * idf * tf 如果 tf 与所有文档相同的其他组件相乘。
这是由于字段规范化造成的,为了修复它,必须禁用 norms 在可搜索字段上,然后重试,我用 norms 在上禁用 content 实地考察,得到了你想要的结果。
索引Map

{
    "mappings": {
        "properties": {
            "content": {
                "type": "text",
                "norms": false
            },
            "title": {
                "type": "text"
            }
        }
    }
}

并使用 bulk 请求,然后使用相同的搜索请求,这将生成以下预期结果:

"hits": [
            {
                "_index": "64180913_1",
                "_type": "_doc",
                "_id": "3",
                "_score": 5.803219,
                "_source": {
                    "title": "Introducing the New React DevTools",
                    "content": "We are excited to announce a new release of accompany the React DevTools tutorial, available today in Chrome, Firefox, and (Chromium) Edge.We are excited to announce a new release of accompany the React tutorial, available today in Chrome, Firefox, and (Chromium) Edge.We are excited to announce a new release of accompany the React DevTools tutorial, available today in Chrome, Firefox, and (Chromium) Edge.We are excited to announce a new release of accompany the React DevTools tutorial, available today in Chrome, Firefox, and (Chromium) Edge.We are excited to announce a new release of accompany the React tutorial, available today in Chrome, Firefox, and (Chromium) Edge.We are excited to announce a new release of accompany the React tutorial, available today in Chrome, Firefox, and (Chromium) Edge.We are excited to announce a new release of accompany the React tutorial, available today in Chrome, Firefox, and (Chromium) EdgeWe are excited to announce a new release of accompany the React  tutorial, available today in Chrome, Firefox, and (Chromium) EdgeWe are excited to announce a new release of accompany the React tutorial, available today in Chrome, Firefox, and (Chromium) EdgeWe are excited to announce a new release of accompany the React DevTools tutorial, available today in Chrome, Firefox, and (Chromium) Edge",
                    "published_date": "2019-08-25",
                    "tags": [
                        "react",
                        "devtools"
                    ],
                    "no_of_likes": 2,
                    "status": "published"
                }
            },
            {
                "_index": "64180913_1",
                "_type": "_doc",
                "_id": "4",
                "_score": 3.5244086,
                "_source": {
                    "title": "Angular Tools for High Performance",
                    "content": "devtools", --> note this its below doc-3
                    "published_date": "2014-03-22",
                    "tags": [
                        "angular",
                        "performance",
                        "fast"
                    ],
                    "no_of_likes": 35,
                    "status": "published"
                }
            },
            {
                "_index": "64180913_1",
                "_type": "_doc",
                "_id": "1",
                "_score": 1.1478703,
                "_source": {
                    "title": "Introduction to elasticsearch",
                    "content": "Elasticsearch is a distributed, open source search slay and tutorial analytics engine for all types of data",
                    "published_date": "2020-01-02",
                    "tags": [
                        "elasticsearch",
                        "distributed",
                        "storage"
                    ],
                    "no_of_likes": 21,
                    "status": "published"
                }
            },
            {
                "_index": "64180913_1",
                "_type": "_doc",
                "_id": "2",
                "_score": 1.1478703,
                "_source": {
                    "title": "Why is Elasticsearch fast?",
                    "content": "It is able to achieve fast search responses because, instead small of tutorial searching the text directly, it searches an index instead",
                    "tags": [
                        "elasticsearch",
                        "fast",
                        "index"
                    ],
                    "no_of_likes": 10,
                    "status": "draft"
                }
            },
            {
                "_index": "64180913_1",
                "_type": "_doc",
                "_id": "5",
                "_score": 1.1478703,
                "_source": {
                    "title": "The new features in Java 14",
                    "content": "Oracle on September 17 said switch expressions tutorial are expected naresh to go final in Java Development Kit 14 (JDK 14). ",
                    "published_date": "2019-07-20",
                    "tags": [
                        "java"
                    ],
                    "no_of_likes": 11,
                    "status": "published"
                }
            }
        ]

p、 学生:这和我的工作无关 synonym 所以我去掉了这一部分,使你的问题简短明了。

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