我已经创建了一个带有完成建议的类别索引，但它的表现并不像我期望的那样。
curl -XPUT http://localhost:9200/categories/category/_mapping -d '{
"category" : {
"properties" : {
"categoryDescription" : {
"type" : "string"
},
"suggest" : {
"type" : "completion",
"analyzer" : "simple",
"search_analyzer" : "simple",
"payloads" : true
}
}
}
}'
我有一个为“墨西哥杂货店”编制索引的类别，当我搜索该字符串时，我的零点击率只有建议结果：
{
"query":{
"fuzzy":{
"categoryDescription":{
"value":"mexican grocery store"
}
}
},
"from":0,
"size":20,
"suggest":{
"category-suggest":{
"text":"mexican grocery store",
"completion":{
"field":"suggest","fuzzy":{"fuzziness":2}
}
}
}
}
{
"took":19,
"timed_out":false,
"_shards":{"total":5,"successful":5,"failed":0},
"hits":{
"total":0,"max_score":null,"hits":[]
},
"suggest":{
"category-suggest":[
{
"text":"mexican grocery store",
"offset":0,
"length":21,
"options":[
{
"text":"Mexican Grocery Store",
"score":1.0,
"payload":{"id":5915028960051200}
}
]
}
]
}
}
我不仅获得完全匹配的零点击，而且当我输入字符串“墨西哥”时，其中包含“医疗”一词的一堆类别列在“墨西哥”类别之前，而不是我也感觉到。
{
"query":{
"fuzzy":{
"categoryDescription":{
"value":"mexican"
}
}
},
"from":0,
"size":20,
"suggest":{
"category-suggest":{
"text":"mexican",
"completion":{
"field":"suggest","fuzzy":{"fuzziness":2}
}
}
}
}
{
"took":11,
"timed_out":false,
"_shards":{
"total":5,
"successful":5,
"failed":0
},
"hits":{
"total":25,
"max_score":3.8085938,
"hits":[
{
"_index":"categories",
"_type":"category",
"_id":"4993638215974912",
"_score":3.8085938,
"_source":{
"id":4993638215974912,
"categoryDescription":"Medical Spa",
"suggest":{
"input":["Medical Spa"],
"output":"Medical Spa",
"payload":{"id":4993638215974912}}}},
{"_index":"categories","_type":"category","_id":"6401013099528192","_score":3.8085938,"_source":{"id":6401013099528192,"categoryDescription":"Medical School","suggest":{"input":["Medical School"],"output":"Medical School","payload":{"id":6401013099528192}}}},{"_index":"categories","_type":"category","_id":"4712163239264256","_score":3.4429123,"_source":{"id":4712163239264256,"categoryDescription":"Medical Examiner","suggest":{"input":["Medical Examiner"],"output":"Medical Examiner","payload":{"id":4712163239264256}}}},{"_index":"categories","_type":"category","_id":"5978800634462208","_score":3.4429123,"_source":{"id":5978800634462208,"categoryDescription":"Medical Center","suggest":{"input":["Medical Center"],"output":"Medical Center","payload":{"id":5978800634462208}}}},{"_index":"categories","_type":"category","_id":"5415850681040896","_score":3.4429123,"_source":{"id":5415850681040896,"categoryDescription":"Medical Clinic","suggest":{"input":["Medical Clinic"],"output":"Medical Clinic","payload":{"id":5415850681040896}}}},{"_index":"categories","_type":"category","_id":"4852900727619584","_score":2.75433,"_source":{"id":4852900727619584,"categoryDescription":"Medical Billing Service","suggest":{"input":["Medical Billing Service"],"output":"Medical Billing Service","payload":{"id":4852900727619584}}}},{"_index":"categories","_type":"category","_id":"5352079006629888","_score":2.4411354,"_source":{"id":5352079006629888,"categoryDescription":"Mexican Restaurant","suggest":{"input":["Mexican Restaurant"],"output":"Mexican Restaurant","payload":{"id":5352079006629888}}}},{"_index":"categories","_type":"category","_id":"5915028960051200","_score":2.143557,"_source":{"id":5915028960051200,"categoryDescription":"Mexican Grocery Store","suggest":{"input":["Mexican Grocery Store","shop"],"output":"Mexican Grocery Store","payload":{"id":5915028960051200}}}},{"_index":"categories","_type":"category","_id":"6392217006505984","_score":2.0527549,"_source":{"id":6392217006505984,"categoryDescription":"Latin American Restaurant","suggest":{"input":["Latin American Restaurant"],"output":"Latin American Restaurant","payload":{"id":6392217006505984}}}},{"_index":"categories","_type":"category","_id":"5149768867119104","_score":2.0527549,"_source":{"id":5149768867119104,"categoryDescription":"Occupational Medical Physician","suggest":{"input":["Occupational Medical Physician"],"output":"Occupational Medical Physician","payload":{"id":5149768867119104}}}},{"_index":"categories","_type":"category","_id":"5157465448513536","_score":2.0527549,"_source":{"id":5157465448513536,"categoryDescription":"Central American Restaurant","suggest":{"input":["Central American Restaurant"],"output":"Central American Restaurant","payload":{"id":5157465448513536}}}},{"_index":"categories","_type":"category","_id":"6479078425100288","_score":2.0527549,"_source":{"id":6479078425100288,"categoryDescription":"American Football Field","suggest":{"input":["American Football Field"],"output":"American Football Field","payload":{"id":6479078425100288}}}},{"_index":"categories","_type":"category","_id":"4789129053208576","_score":1.9529084,"_source":{"id":4789129053208576,"categoryDescription":"Mexican Goods Store","suggest":{"input":["Mexican Goods Store","shop"],"output":"Mexican Goods Store","payload":{"id":4789129053208576}}}},{"_index":"categories","_type":"category","_id":"5275113192685568","_score":1.9138902,"_source":{"id":5275113192685568,"categoryDescription":"Medical Laboratory","suggest":{"input":["Medical Laboratory"],"output":"Medical Laboratory","payload":{"id":5275113192685568}}}},{"_index":"categories","_type":"category","_id":"5838063146106880","_score":1.7436681,"_source":{"id":5838063146106880,"categoryDescription":"Medical Group","suggest":{"input":["Medical Group"],"output":"Medical Group","payload":{"id":5838063146106880}}}},{"_index":"categories","_type":"category","_id":"4649491076481024","_score":1.7436681,"_source":{"id":4649491076481024,"categoryDescription":"American Restaurant","suggest":{"input":["American Restaurant"],"output":"American Restaurant","payload":{"id":4649491076481024}}}},{"_index":"categories","_type":"category","_id":"5458456756617216","_score":1.5311122,"_source":{"id":5458456756617216,"categoryDescription":"Traditional American Restaurant","suggest":{"input":["Traditional American Restaurant"],"output":"Traditional American Restaurant","payload":{"id":5458456756617216}}}},{"_index":"categories","_type":"category","_id":"6183309797228544","_score":1.5311122,"_source":{"id":6183309797228544,"categoryDescription":"Public Medical Center","suggest":{"input":["Public Medical Center"],"output":"Public Medical Center","payload":{"id":6183309797228544}}}},{"_index":"categories","_type":"category","_id":"6706677332049920","_score":1.5311122,"_source":{"id":6706677332049920,"categoryDescription":"Native American Goods Store","suggest":{"input":["Native American Goods Store","shop"],"output":"Native American Goods Store","payload":{"id":6706677332049920}}}},{"_index":"categories","_type":"category","_id":"6119538122817536","_score":1.3949344,"_source":{"id":6119538122817536,"categoryDescription":"Medical Supply Store","suggest":{"input":["Medical Supply Store","shop"],"output":"Medical Supply Store","payload":{"id":6119538122817536}}}}]},"suggest":{"category-suggest":[{"text":"mexican","offset":0,"length":7,"options":[{"text":"Medical Billing Service","score":1.0,"payload":{"id":4852900727619584}},{"text":"Medical Center","score":1.0,"payload":{"id":5978800634462208}},{"text":"Medical Clinic","score":1.0,"payload":{"id":5415850681040896}},{"text":"Medical Examiner","score":1.0,"payload":{"id":4712163239264256}},{"text":"Medical Group","score":1.0,"payload":{"id":5838063146106880}}]}]}}
答案 0 :(得分：3)
您将字段categoryDescription编入索引为string，因此Elasticsearch会在您的输入上运行其标准分析器，并将Mexican Grocery Store转换为三个令牌[mexican, grocery, store]。
fuzzy查询属于术语查询系列，也就是说，它在术语级别上运行，并且不会通过任何分析器运行。输入Mexican Grocery Store的模糊查询将尝试将这些单词匹配为一个术语，而不是3个不同的术语。它没有找到任何东西，因为完整的短语并不作为索引中的一个术语存在。您可以向未分析的categoryDescription添加子字段，或仅使用小写标记过滤器，并在此字段上运行模糊查询以产生＆＃34;完全匹配＆＃34;。
对于第二部分，模糊查询不区分已修改的匹配（应用模糊性）和完全匹配。 在执行实际搜索之前，模糊术语在内部与给定字段中的所有术语列表进行匹配并进行扩展。在你的例子中，它变成类似
的东西"boolean": {
"should": [
{
"term": {
"categoryDescription": "medical"
}
},
{
"term": {
"categoryDescription": "mexican"
}
}
]
}
由此可以清楚地了解为什么会返回Medical Spa这样的内容。这些匹配的得分也高于Mexican Grocery Store，因此首先返回。我怀疑这是由于术语频率（医学比墨西哥人更频繁出现），但是应该在启用explain的情况下再次运行查询，以确切了解分数为何更高。
如果要对模糊匹配应用惩罚，可以将模糊和术语查询包装到布尔查询中：
{
"query": {
"boolean": {
"should": [
{
"fuzzy": {
"categoryDescription": "mexican"
}
},
{
"term": {
"categoryDescription": "mexican"
}
}
]
}
}
}
这将削减只有fuzzy部分匹配的文档的分数（由于布尔查询的坐标因素）。