搜索的时候，可能输入的搜索文本会出现误拼写的情况
doc1: hello world
doc2: hello java
搜索：hallo world
fuzzy搜索技术 --> 自动将拼写错误的搜索文本，进行纠正，纠正以后去尝试匹配索引中的数据
添加数据
| POST /my_index/my_type/_bulk { "index": { "_id": 1 }} { "text": "Surprise me!"} { "index": { "_id": 2 }} { "text": "That was surprising."} { "index": { "_id": 3 }} { "text": "I wasn't surprised."}
|
Fuzziness 举例
| GET /my_index/my_type/_search { "query": { "fuzzy": { "text": { "value": "surprize", "fuzziness": 2 } } } } 结果： { "took": 27, "timed_out": false, "_shards": { "total": 5, "successful": 5, "failed": 0 }, "hits": { "total": 2, "max_score": 0.22585157, "hits": [ { "_index": "my_index", "_type": "my_type", "_id": "1", "_score": 0.22585157, "_source": { "text": "Surprise me!" } }, { "_index": "my_index", "_type": "my_type", "_id": "3", "_score": 0.1898702, "_source": { "text": "I wasn't surprised." } } ] } } |
surprize --> 拼写错误 --> surprise --> s -> z
surprize --> surprise -> z -> s，纠正一个字母，就可以匹配上，所以在fuziness指定的2范围内
surprize --> surprised -> z -> s，末尾加个d，纠正了2次，也可以匹配上，在fuziness指定的2范围内
surprize --> surprising -> z -> s，去掉e，ing，3次，总共要5次，才可以匹配上，始终纠正不了
fuzzy搜索以后，会自动尝试将你的搜索文本进行纠错，然后去跟文本进行匹配
fuzziness，你的搜索文本最多可以纠正几个字母去跟你的数据进行匹配，默认如果不设置，就是2,而且他有一个范围，及时你写了一个很大的fuzziness，也会不纠正。
一般使用技巧
| GET /my_index/my_type/_search { "query": { "match": { "text": { "query": "SURPIZE ME", "fuzziness": "AUTO", "operator": "and" } } } } 结果： { "took": 8, "timed_out": false, "_shards": { "total": 5, "successful": 5, "failed": 0 }, "hits": { "total": 1, "max_score": 0.44248468, "hits": [ { "_index": "my_index", "_type": "my_type", "_id": "1", "_score": 0.44248468, "_source": { "text": "Surprise me!" } } ] } } |