--- title: "Constant Score 查询" date: 0001-01-01 summary: "Constant Score 查询 # 如果您需要返回包含某个词的文档，而不管该词出现多少次，您可以使用 constant_score 查询。constant_score 查询包装一个过滤器查询，并将结果中的所有文档的关联分数设置为 boost 参数的值。因此，所有返回的文档具有相同的关联分数，并且不考虑词频/逆文档频率（TF/IDF）。过滤器查询不会计算关联分数。此外，Easysearch 会缓存常用的过滤器查询以提高性能。 相关指南（先读这些） # 查询 DSL 基础 结构化搜索 参考样例 # 使用以下查询返回 shakespeare 索引中包含单词“Hamlet”的文档： GET shakespeare/_search { "query": { "constant_score": { "filter": { "match": { "text_entry": "Hamlet" } }, "boost": 1.2 } } } 结果中的所有文档都被分配了 1.2 的相关性分数： { "took": 8, "timed_out": false, "_shards": { "total": 1, "successful": 1, "skipped": 0, "failed": 0 }, "hits": { "total": { "value": 96, "relation": "eq" }, "max_score": 1." --- # Constant Score 查询 如果您需要返回包含某个词的文档，而不管该词出现多少次，您可以使用 `constant_score` 查询。`constant_score` 查询包装一个过滤器查询，并将结果中的所有文档的关联分数设置为 `boost` 参数的值。因此，所有返回的文档具有相同的关联分数，并且不考虑词频/逆文档频率（TF/IDF）。过滤器查询不会计算关联分数。此外，Easysearch 会缓存常用的过滤器查询以提高性能。 ## 相关指南（先读这些） - [查询 DSL 基础]({{< relref "/docs/features/query-dsl/query-dsl-basics.md" >}}) - [结构化搜索]({{< relref "/docs/features/query-dsl/structured-search.md" >}}) ## 参考样例 使用以下查询返回 `shakespeare` 索引中包含单词“Hamlet”的文档： ``` GET shakespeare/_search { "query": { "constant_score": { "filter": { "match": { "text_entry": "Hamlet" } }, "boost": 1.2 } } } ``` 结果中的所有文档都被分配了 1.2 的相关性分数： ``` { "took": 8, "timed_out": false, "_shards": { "total": 1, "successful": 1, "skipped": 0, "failed": 0 }, "hits": { "total": { "value": 96, "relation": "eq" }, "max_score": 1.2, "hits": [ { "_index": "shakespeare", "_id": "32535", "_score": 1.2, "_source": { "type": "line", "line_id": 32536, "play_name": "Hamlet", "speech_number": 48, "line_number": "1.1.97", "speaker": "HORATIO", "text_entry": "Dared to the combat; in which our valiant Hamlet--" } }, { "_index": "shakespeare", "_id": "32546", "_score": 1.2, "_source": { "type": "line", "line_id": 32547, "play_name": "Hamlet", "speech_number": 48, "line_number": "1.1.108", "speaker": "HORATIO", "text_entry": "His fell to Hamlet. Now, sir, young Fortinbras," } }, { "_index": "shakespeare", "_id": "32625", "_score": 1.2, "_source": { "type": "line", "line_id": 32626, "play_name": "Hamlet", "speech_number": 59, "line_number": "1.1.184", "speaker": "HORATIO", "text_entry": "Unto young Hamlet; for, upon my life," } }, { "_index": "shakespeare", "_id": "32633", "_score": 1.2, "_source": { "type": "line", "line_id": 32634, "play_name": "Hamlet", "speech_number": 60, "line_number": "", "speaker": "MARCELLUS", "text_entry": "Enter KING CLAUDIUS, QUEEN GERTRUDE, HAMLET, POLONIUS, LAERTES, VOLTIMAND, CORNELIUS, Lords, and Attendants" } }, { "_index": "shakespeare", "_id": "32634", "_score": 1.2, "_source": { "type": "line", "line_id": 32635, "play_name": "Hamlet", "speech_number": 1, "line_number": "1.2.1", "speaker": "KING CLAUDIUS", "text_entry": "Though yet of Hamlet our dear brothers death" } }, { "_index": "shakespeare", "_id": "32699", "_score": 1.2, "_source": { "type": "line", "line_id": 32700, "play_name": "Hamlet", "speech_number": 8, "line_number": "1.2.65", "speaker": "KING CLAUDIUS", "text_entry": "But now, my cousin Hamlet, and my son,--" } }, { "_index": "shakespeare", "_id": "32703", "_score": 1.2, "_source": { "type": "line", "line_id": 32704, "play_name": "Hamlet", "speech_number": 12, "line_number": "1.2.69", "speaker": "QUEEN GERTRUDE", "text_entry": "Good Hamlet, cast thy nighted colour off," } }, { "_index": "shakespeare", "_id": "32723", "_score": 1.2, "_source": { "type": "line", "line_id": 32724, "play_name": "Hamlet", "speech_number": 16, "line_number": "1.2.89", "speaker": "KING CLAUDIUS", "text_entry": "Tis sweet and commendable in your nature, Hamlet," } }, { "_index": "shakespeare", "_id": "32754", "_score": 1.2, "_source": { "type": "line", "line_id": 32755, "play_name": "Hamlet", "speech_number": 17, "line_number": "1.2.120", "speaker": "QUEEN GERTRUDE", "text_entry": "Let not thy mother lose her prayers, Hamlet:" } }, { "_index": "shakespeare", "_id": "32759", "_score": 1.2, "_source": { "type": "line", "line_id": 32760, "play_name": "Hamlet", "speech_number": 19, "line_number": "1.2.125", "speaker": "KING CLAUDIUS", "text_entry": "This gentle and unforced accord of Hamlet" } } ] } } ``` ## 参数说明 下表列出了 `constant_score` 查询支持的所有顶层参数。 | 参数 | 描述 | | -------- | ------------------------------------------------------------ | | `filter` | 文档必须匹配的过滤器查询才能在结果中返回。必填。 | | `boost` | 分配给所有返回文档的相关性分数的浮点值。可选。默认值为 1.0。 |