查询Elasticsearch嵌套类型数据，且只返回嵌套数据中命中的元素.md
## 测试环境
- Elasticsearch 6.3
- Kibana 6.3
## 造点测试数据
新建一个index做为测试
如下是一个存储博客文章及其评论的数据结构，评论(comments)是nested类型：java
PUT /es_blog
{
"mappings": {
"blogpost": {
"properties": {
"title": {
"type": "text"
},
"summary": {
"type": "text"
},
"content": {
"type": "text"
},
"comments": {
"type": "nested",
"properties": {
"name": {
"type": "text"
},
"comment": {
"type": "text"
},
"age": {
"type": "short"
},
"stars": {
"type": "short"
},
"date": {
"type": "date"
}
}
}
}
}
}
}
写入一些测试数据
PUT /es_blog/blogpost/1
{
"title": "无标题",
"summary": "全栈工程师、JAVA、HTML5",
"content": "全栈工程师须要掌握：JAVA、HTML五、JavaScript、经常使用缓存、大数据等等",
"comments": [
{
"name": "John Smith",
"comment": "Great article",
"age": 28,
"stars": 4,
"date": "2014-09-01"
},
{
"name": "Alice White",
"comment": "More like this please",
"age": 31,
"stars": 5,
"date": "2014-10-22"
}
]
}
PUT /es_blog/blogpost/2
{
"title": "Java后端开发工程师",
"summary": "JAVA、Oracle、Hibernate、Spring",
"content": "Java后端开发工程师须要掌握：JAVA、Oracle、Hibernate、Spring、经常使用缓存等等",
"comments": [
{
"name": "John Smith",
"comment": "工程师真牛",
"age": 28,
"stars": 4,
"date": "2014-09-01"
},
{
"name": "Alice White",
"comment": "Java工程师真牛",
"age": 31,
"stars": 5,
"date": "2014-10-22"
}
]
}
PUT /es_blog/blogpost/3
{
"title": "大数据工程师",
"summary": "Hadoop、Hive、Hdfs、JAVA",
"content": "大数据工程师须要掌握：Hadoop、Hive、Hdfs、JAVA、Spark、流式计算等等",
"comments": [
{
"name": "John Smith",
"comment": "大数据工程师真牛",
"age": 28,
"stars": 4,
"date": "2014-09-01"
},
{
"name": "Alice White",
"comment": "我不会啊",
"age": 31,
"stars": 5,
"date": "2014-10-22"
}
]
}
PUT /es_blog/blogpost/4
{
"title": "机器学习工程师",
"summary": "Python、回归算法、分类算法、神经网络、数据基础",
"content": "机器学习工程师须要掌握：Python、回归算法、分类算法、神经网络、有扎实的数据基础等等",
"comments": [
{
"name": "John Smith",
"comment": "机器学习NX",
"age": 28,
"stars": 4,
"date": "2014-09-01"
},
{
"name": "Alice White",
"comment": "Python好学么？",
"age": 31,
"stars": 5,
"date": "2014-10-22"
}
]
}
## 执行查询
查询文本字段中出现了[工程师]的数据
GET es_blog/blogpost/_search
{
"_source": {
"includes": [
"*"
],
"excludes": [
"comments" //去掉返回结果中父级中的comments信息
]
},
"query": {
"bool": {
"should": [
{
"match": {
"title": "工程师"
}
},
{
"match": {
"summary": "工程师"
}
},
{
"match": {
"content": "工程师"
}
},
{
"nested": {
"path": "comments",
"query": {
"bool": {
"should": [
{
"match": {
"comments.comment": "工程师"
}
}
]
}
},
"inner_hits": {}
}
}
]
}
}
}
返回结果：python
{
"took": 9,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 4,
"max_score": 3.5560012,
"hits": [
{
"_index": "es_blog",
"_type": "blogpost",
"_id": "3",
"_score": 3.5560012,
"_source": {
"summary": "Hadoop、Hive、Hdfs、JAVA",
"title": "大数据工程师",
"content": "大数据工程师须要掌握：Hadoop、Hive、Hdfs、JAVA、Spark、流式计算等等"
},
"inner_hits": {
"comments": {
"hits": {
"total": 1,
"max_score": 1.8299085,
"hits": [
{
"_index": "es_blog",
"_type": "blogpost",
"_id": "3",
"_nested": {
"field": "comments",
"offset": 0
},
"_score": 1.8299085,
"_source": {
"name": "John Smith",
"comment": "大数据工程师真牛",
"age": 28,
"stars": 4,
"date": "2014-09-01"
}
}
]
}
}
}
},
{
"_index": "es_blog",
"_type": "blogpost",
"_id": "2",
"_score": 3.1327708,
"_source": {
"summary": "JAVA、Oracle、Hibernate、Spring",
"title": "Java后端开发工程师",
"content": "Java后端开发工程师须要掌握：JAVA、Oracle、Hibernate、Spring、经常使用缓存等等"
},
"inner_hits": {
"comments": {
"hits": {
"total": 2,
"max_score": 2.0794415,
"hits": [
{
"_index": "es_blog",
"_type": "blogpost",
"_id": "2",
"_nested": {
"field": "comments",
"offset": 0
},
"_score": 2.0794415,
"_source": {
"name": "John Smith",
"comment": "工程师真牛",
"age": 28,
"stars": 4,
"date": "2014-09-01"
}
},
{
"_index": "es_blog",
"_type": "blogpost",
"_id": "2",
"_nested": {
"field": "comments",
"offset": 1
},
"_score": 1.9221728,
"_source": {
"name": "Alice White",
"comment": "Java工程师真牛",
"age": 31,
"stars": 5,
"date": "2014-10-22"
}
}
]
}
}
}
},
{
"_index": "es_blog",
"_type": "blogpost",
"_id": "1",
"_score": 1.7260926,
"_source": {
"summary": "全栈工程师、JAVA、HTML5",
"title": "无标题",
"content": "全栈工程师须要掌握：JAVA、HTML五、JavaScript、经常使用缓存、大数据等等"
},
"inner_hits": {
"comments": {
"hits": {
"total": 0,
"max_score": null,
"hits": []
}
}
}
},
{
"_index": "es_blog",
"_type": "blogpost",
"_id": "4",
"_score": 1.0651813,
"_source": {
"summary": "Python、回归算法、分类算法、神经网络、数据基础",
"title": "机器学习工程师",
"content": "机器学习工程师须要掌握：Python、回归算法、分类算法、神经网络、有扎实的数据基础等等"
},
"inner_hits": {
"comments": {
"hits": {
"total": 0,
"max_score": null,
"hits": []
}
}
}
}
]
}
}
查询content中出现[java]或评论中出现[python]的数据
GET es_blog/blogpost/_search
{
"_source": {
"includes": [
"*"
],
"excludes": [
"comments"
]
},
"query": {
"bool": {
"should": [
{
"match": {
"content": "java"
}
},
{
"nested": {
"path": "comments",
"query": {
"bool": {
"should": [
{
"match": {
"comments.comment": "python"
}
}
]
}
},
"inner_hits": {}
}
}
]
}
}
}
返回结果算法
{
"took": 9,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 4,
"max_score": 1.3112576,
"hits": [
{
"_index": "es_blog",
"_type": "blogpost",
"_id": "4",
"_score": 1.3112576,
"_source": {
"summary": "Python、回归算法、分类算法、神经网络、数据基础",
"title": "机器学习工程师",
"content": "机器学习工程师须要掌握：Python、回归算法、分类算法、神经网络、有扎实的数据基础等等"
},
"inner_hits": {
"comments": {
"hits": {
"total": 1,
"max_score": 1.3112576,
"hits": [
{
"_index": "es_blog",
"_type": "blogpost",
"_id": "4",
"_nested": {
"field": "comments",
"offset": 1
},
"_score": 1.3112576,
"_source": {
"name": "Alice White",
"comment": "Python好学么？",
"age": 31,
"stars": 5,
"date": "2014-10-22"
}
}
]
}
}
}
},
{
"_index": "es_blog",
"_type": "blogpost",
"_id": "2",
"_score": 0.75974846,
"_source": {
"summary": "JAVA、Oracle、Hibernate、Spring",
"title": "Java后端开发工程师",
"content": "Java后端开发工程师须要掌握：JAVA、Oracle、Hibernate、Spring、经常使用缓存等等"
},
"inner_hits": {
"comments": {
"hits": {
"total": 0,
"max_score": null,
"hits": []
}
}
}
},
{
"_index": "es_blog",
"_type": "blogpost",
"_id": "1",
"_score": 0.2876821,
"_source": {
"summary": "全栈工程师、JAVA、HTML5",
"title": "无标题",
"content": "全栈工程师须要掌握：JAVA、HTML五、JavaScript、经常使用缓存、大数据等等"
},
"inner_hits": {
"comments": {
"hits": {
"total": 0,
"max_score": null,
"hits": []
}
}
}
},
{
"_index": "es_blog",
"_type": "blogpost",
"_id": "3",
"_score": 0.2876821,
"_source": {
"summary": "Hadoop、Hive、Hdfs、JAVA",
"title": "大数据工程师",
"content": "大数据工程师须要掌握：Hadoop、Hive、Hdfs、JAVA、Spark、流式计算等等"
},
"inner_hits": {
"comments": {
"hits": {
"total": 0,
"max_score": null,
"hits": []
}
}
}
}
]
}
}
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相关文章
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