我正在尝试索引包含连字符但不包含空格,句点或任何其他标点符号的字符串。我不想基于连字符拆分单词,而是希望将连字符作为索引文本的一部分。
例如,我的6个文本字符串将是:
我希望能够在这些字符串中搜索包含&#34;播放&#34; 的文字,或者搜索以&#34;杂志开头的文字&#34; < /强>
我已经能够使用 ngram 来制作包含&#34; play&#34;好好工作。但是,连字符会导致文本分裂,并且包含结果,其中&#34; magazine&#34;在连字符后面的单词。我只想要在&#34; magazine&#34;字符串开头的单词开头。出现。
根据上面的示例,当从&#34;杂志&#34;开始时,只会出现这3个:
请帮助我的ElasticSearch Index Sample:
DELETE /sample
PUT /sample
{
"settings": {
"index.number_of_shards":5,
"index.number_of_replicas": 0,
"analysis": {
"filter": {
"nGram_filter": {
"type": "nGram",
"min_gram": 2,
"max_gram": 20,
"token_chars": [
"letter",
"digit"
]
},
"word_delimiter_filter": {
"type": "word_delimiter",
"preserve_original": true,
"catenate_all" : true
}
},
"analyzer": {
"ngram_index_analyzer": {
"type" : "custom",
"tokenizer": "lowercase",
"filter" : ["nGram_filter", "word_delimiter_filter"]
}
}
}
}
}
PUT /sample/1/_create
{
"name" : "magazineplayon"
}
PUT /sample/3/_create
{
"name" : "magazineofhorses"
}
PUT /sample/4/_create
{
"name" : "online-magazine"
}
PUT /sample/5/_create
{
"name" : "best-magazine"
}
PUT /sample/6/_create
{
"name" : "friend-of-magazines"
}
PUT /sample/7/_create
{
"name" : "magazineplaygames"
}
GET /sample/_search
{
"query": {
"wildcard": {
"name": "*play*"
}
}
}
GET /sample/_search
{
"query": {
"wildcard": {
"name": "magazine*"
}
}
}
更新1 我更新了所有的create语句,以便在示例后使用TEST:
PUT /sample/test/7/_create
{
"name" : "magazinefairplay"
}
然后我运行以下命令只返回带有&#34; play&#34;在他们而不是做通配符搜索。这工作正常,只返回两个记录。
POST /sample/test/_search
{
"query": {
"bool": {
"minimum_should_match": 1,
"should": [
{"match": { "name.substrings": "play" }}
]
}
}
}
我运行以下命令只返回以&#34; magazine&#34;开头的名字。我的期望是&#34;在线杂志&#34;,&#34;最佳杂志&#34;和#34;杂志的朋友&#34;不会出现。然而,归还了所有七个记录,包括这三个记录。
POST /sample/test/_search
{
"query": {
"bool": {
"minimum_should_match": 1,
"should": [
{"match": { "name.prefixes": "magazine" }}
]
}
}
}
有没有办法过滤掉使用连字符的前缀?
答案 0 :(得分:4)
您正走在正确的道路上,但是,您还需要添加另一个利用edge-ngram
token filter的分析器,以使&#34;以&#34;开头。约束工作。您可以保留ngram
以检查&#34;包含&#34;一个给定的单词,但您需要edge-ngram
来检查字段&#34;是否以&#34;一些令牌。
PUT /sample
{
"settings": {
"index.number_of_shards": 5,
"index.number_of_replicas": 0,
"analysis": {
"filter": {
"nGram_filter": {
"type": "nGram",
"min_gram": 2,
"max_gram": 20,
"token_chars": [
"letter",
"digit"
]
},
"edgenGram_filter": {
"type": "edgeNGram",
"min_gram": 2,
"max_gram": 20
}
},
"analyzer": {
"ngram_index_analyzer": {
"type": "custom",
"tokenizer": "keyword",
"filter": [
"lowercase",
"nGram_filter"
]
},
"edge_ngram_index_analyzer": {
"type": "custom",
"tokenizer": "keyword",
"filter": [
"lowercase",
"edgenGram_filter"
]
}
}
}
},
"mappings": {
"test": {
"properties": {
"name": {
"type": "string",
"fields": {
"prefixes": {
"type": "string",
"analyzer": "edge_ngram_index_analyzer",
"search_analyzer": "standard"
},
"substrings": {
"type": "string",
"analyzer": "ngram_index_analyzer",
"search_analyzer": "standard"
}
}
}
}
}
}
}
然后您的查询将成为(即搜索name
字段包含play
或以magazine
开头的所有文档)
POST /sample/test/_search
{
"query": {
"bool": {
"minimum_should_match": 1,
"should": [
{"match": { "name.substrings": "play" }},
{"match": { "name.prefixes": "magazine" }}
]
}
}
}