您好,我是弹性世界的新手,我试图弄清楚如何查找例如“ text”(代表被索引的整个文本)的字段的日期是否在特定范围内?
示例: 在doc_1字段“文本”中,我们有“我出生于1995年5月27日”,我想检查该文档中是否包含日期,该日期介于1995年5月20日至1995年5月30日之间。 / p>
如果这不可能,那么当我为该文档建立索引时,如何将日期“ 27/05/1995”并将其存储到新字段中?当我们谈论索引包含日期的文档时,您能给我一些关于最佳方法的提示吗?
谢谢
答案 0 :(得分:1)
我认为您在这里有多种选择。要搜索在您的日期范围内的文档,您必须从文本中解析日期并将它们索引为elasticsearch中的日期字段。您可以在将文档发送到elasticsearch之前在应用程序内部执行此操作,也可以查看摄取节点。提取节点使您有机会在建立索引之前进行预处理。 https://www.elastic.co/guide/en/elasticsearch/reference/current/ingest.html
一旦Elasticsearch中的文档带有单独的日期字段,您就可以使用范围查询进行搜索:https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-range-query.html
答案 1 :(得分:0)
我在下面使用正则表达式来匹配文本中的某些日期。我要查找的日期格式是“ yyyy-mm-dd”,您可以将span_multi内在子句改编,以查找所需的格式。您可以了解跨度here
映射
PUT testindex
{
"mappings": {
"properties": {
"content":{
"type": "text"
}
}
}
}
数据:
[
{
"_index" : "testindex",
"_type" : "_doc",
"_id" : "a3PLFW0BY3127H1HVxyC",
"_score" : 1.0,
"_source" : {
"content" : "I was born on 2019/09/01"
}
},
{
"_index" : "testindex",
"_type" : "_doc",
"_id" : "bXPLFW0BY3127H1HaBwp",
"_score" : 1.0,
"_source" : {
"content" : "I was born on 2019/09/15"
}
},
{
"_index" : "testindex",
"_type" : "_doc",
"_id" : "w3PLFW0BY3127H1HeBzg",
"_score" : 1.0,
"_source" : {
"content" : "I was born on 2019/09/20"
}
}
]
查询:
GET testindex/_search
{
"query": {
"span_near": {
"clauses": [
{
----> clauses below look for year,month,date, you can change their order for desired
---->format
"span_multi": {
"match": {
"regexp": {
"content": "(19|20)[0-9]{2}"
}
}
}
},
{
"span_multi": {
"match": {
"regexp": {
"content": "0[1-9]|1[012]"
}
}
}
},
{
"span_multi": {
"match": {
"regexp": {
"content": "1[5-9]|[2][0]" --> regex for date from 15-20
}
}
}
}
],
"slop": 0,
"in_order": true
}
}
}
结果
[
{
"_index" : "testindex",
"_type" : "_doc",
"_id" : "bXPLFW0BY3127H1HaBwp",
"_score" : 3.2095504,
"_source" : {
"content" : "I was born on 2019/09/15"
}
},
{
"_index" : "testindex",
"_type" : "_doc",
"_id" : "w3PLFW0BY3127H1HeBzg",
"_score" : 3.2095504,
"_source" : {
"content" : "I was born on 2019/09/20"
}
}
]