CC00021.elasticsearch——|Hadoop&ElasticSearch.V21|——|ELK.v21|集群|QueryDSL|词条级搜索.V1|

### --- 词条级搜索  ~~~     可以使用term-level queries根据结构化数据中的精确值找到文档。 ~~~     结构化数据的值包括日期范围，IP地址、价格或产品ID。 ~~~     不同于全文查询，term-level queries不分析搜索词。 ~~~     相反，条目与存储在字段级别中的术语完全匹配。

### --- 词条级搜索示例  PUT /book {   "settings": {},   "mappings" : {   "properties" : {   "description" : {   "type" : "text",   "analyzer" : "ik_max_word"   },   "name" : {   "type" : "text",   "analyzer" : "ik_max_word"   },   "price" : {   "type" : "float"   },   "timestamp" : {   "type" : "date",   "format" : "yyyy-MM-dd HH:mm:ss||yyyy-MM-dd||epoch_millis"   }   }   } }

PUT /book/_doc/1 {   "name": "lucene",   "description": "Lucene Core is a Java library providing powerful indexing and search features, as well as spellchecking, hit highlighting and advanced analysis/tokenization capabilities. The PyLucene sub project provides Python bindings for Lucene Core. ",   "price":100.45,   "timestamp":"2021-11-21 19:11:35" }

PUT /book/_doc/2 {   "name": "solr",   "description": "Solr is highly scalable, providing fully fault tolerant distributed indexing, search and analytics. It exposes Lucenes features through easy to use JSON/HTTP interfaces or native clients for Java and other languages.",   "price":320.45,   "timestamp":"2021-11-21 17:11:35" }

PUT /book/_doc/3 {   "name": "Hadoop",   "description": "The Apache Hadoop software library is a framework that allows for the distributed processing of large data sets across clusters of computers using simple programming models.",   "price":620.45,   "timestamp":"2021-11-22 19:18:35" }

PUT /book/_doc/4 {   "name": "ElasticSearch",   "description": "Elasticsearch是一个基于Lucene搜索服务器。基于分布式多用户能力的全文搜索引擎RESTful web接口。Elasticsearch是用Java并作为语言开发Apache开放源代码发布在许可条款下，是一种流行的企业级搜索引擎。Elasticsearch用于云计算，可实现实时搜索，稳定、可靠、快速、安装使用方便。官方客户端在Java、.NET(C#)、PHP、Python、Apache Groovy、Ruby它可以用于许多其他语言。根据DB-Engines排名显示，Elasticsearch是最受欢迎的企业搜索引擎，其次是Apache Solr，也是基于Lucene。",   "price":999.99,   "timestamp":"2021-11-15 10:11:35" }