查詢Elasticsearch嵌套類型數據，且只返回嵌套數據中命中的元素
阿新 • • 發佈：2018-07-14
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測試環境
- Elasticsearch 6.3
- Kibana 6.3
造點測試數據
新建一個index作為測試
以下是一個存儲博客文章及其評論的數據結構，評論(comments)是nested類型：
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" } } } } } } }
寫入一些測試數據
PUT /es_blog/blogpost/1 { "title": "無標題", "summary": "全棧工程師、JAVA、HTML5", "content": "全棧工程師需要掌握：JAVA、HTML5、JavaScript、常用緩存、大數據等等", "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後端開發工程師", "summary": "JAVA、Oracle、Hibernate、Spring", "content": "Java後端開發工程師需要掌握：JAVA、Oracle、Hibernate、Spring、常用緩存等等", "comments": [ { "name": "John Smith", "comment": "工程師真牛", "age": 28, "stars": 4, "date": "2014-09-01" }, { "name": "Alice White", "comment": "Java工程師真牛", "age": 31, "stars": 5, "date": "2014-10-22" } ] } PUT /es_blog/blogpost/3 { "title": "大數據工程師", "summary": "Hadoop、Hive、Hdfs、JAVA", "content": "大數據工程師需要掌握：Hadoop、Hive、Hdfs、JAVA、Spark、流式計算等等", "comments": [ { "name": "John Smith", "comment": "大數據工程師真牛", "age": 28, "stars": 4, "date": "2014-09-01" }, { "name": "Alice White", "comment": "我不會啊", "age": 31, "stars": 5, "date": "2014-10-22" } ] } PUT /es_blog/blogpost/4 { "title": "機器學習工程師", "summary": "Python、回歸算法、分類算法、神經網絡、數據基礎", "content": "機器學習工程師需要掌握：Python、回歸算法、分類算法、神經網絡、有紮實的數據基礎等等", "comments": [ { "name": "John Smith", "comment": "機器學習NX", "age": 28, "stars": 4, "date": "2014-09-01" }, { "name": "Alice White", "comment": "Python好學麽？", "age": 31, "stars": 5, "date": "2014-10-22" } ] }
執行查詢
查詢文本字段中出現了[工程師]的數據
GET es_blog/blogpost/_search { "_source": { "includes": [ "*" ], "excludes": [ "comments" //去掉返回結果中父級中的comments信息 ] }, "query": { "bool": { "should": [ { "match": { "title": "工程師" } }, { "match": { "summary": "工程師" } }, { "match": { "content": "工程師" } }, { "nested": { "path": "comments", "query": { "bool": { "should": [ { "match": { "comments.comment": "工程師" } } ] } }, "inner_hits": {} } } ] } } }
返回結果：
{
"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": "大數據工程師",
"content": "大數據工程師需要掌握：Hadoop、Hive、Hdfs、JAVA、Spark、流式計算等等"
},
"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": "大數據工程師真牛",
"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後端開發工程師",
"content": "Java後端開發工程師需要掌握：JAVA、Oracle、Hibernate、Spring、常用緩存等等"
},
"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": "工程師真牛",
"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工程師真牛",
"age": 31,
"stars": 5,
"date": "2014-10-22"
}
}
]
}
}
}
},
{
"_index": "es_blog",
"_type": "blogpost",
"_id": "1",
"_score": 1.7260926,
"_source": {
"summary": "全棧工程師、JAVA、HTML5",
"title": "無標題",
"content": "全棧工程師需要掌握：JAVA、HTML5、JavaScript、常用緩存、大數據等等"
},
"inner_hits": {
"comments": {
"hits": {
"total": 0,
"max_score": null,
"hits": []
}
}
}
},
{
"_index": "es_blog",
"_type": "blogpost",
"_id": "4",
"_score": 1.0651813,
"_source": {
"summary": "Python、回歸算法、分類算法、神經網絡、數據基礎",
"title": "機器學習工程師",
"content": "機器學習工程師需要掌握：Python、回歸算法、分類算法、神經網絡、有紮實的數據基礎等等"
},
"inner_hits": {
"comments": {
"hits": {
"total": 0,
"max_score": null,
"hits": []
}
}
}
}
]
}
}查詢content中出現[java]或評論中出現[python]的數據
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": {}
}
}
]
}
}
}返回結果
{
"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、回歸算法、分類算法、神經網絡、數據基礎",
"title": "機器學習工程師",
"content": "機器學習工程師需要掌握：Python、回歸算法、分類算法、神經網絡、有紮實的數據基礎等等"
},
"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好學麽？",
"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後端開發工程師",
"content": "Java後端開發工程師需要掌握：JAVA、Oracle、Hibernate、Spring、常用緩存等等"
},
"inner_hits": {
"comments": {
"hits": {
"total": 0,
"max_score": null,
"hits": []
}
}
}
},
{
"_index": "es_blog",
"_type": "blogpost",
"_id": "1",
"_score": 0.2876821,
"_source": {
"summary": "全棧工程師、JAVA、HTML5",
"title": "無標題",
"content": "全棧工程師需要掌握：JAVA、HTML5、JavaScript、常用緩存、大數據等等"
},
"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": "大數據工程師",
"content": "大數據工程師需要掌握：Hadoop、Hive、Hdfs、JAVA、Spark、流式計算等等"
},
"inner_hits": {
"comments": {
"hits": {
"total": 0,
"max_score": null,
"hits": []
}
}
}
}
]
}
}<wiz_tmp_tag id="wiz-table-range-border" contenteditable="false" style="display: none;">
查詢Elasticsearch嵌套類型數據，且只返回嵌套數據中命中的元素