ES返回结果过滤 _source_includes和_source_excludes

1. 造点测试数据
2. _source参数
- 2.1 根据id查询时，只返回_source
- 2.2 设置_source=false，则不返回_source
3. 在请求体中设置_source_includes和_source_excludes
- 3.1 _source_includes:只返回部分字段
- 3.2 如果只是_source_includes可以简写如下
- 3.3 _source_excludes：屏蔽部分字段
- 3.4 都有时，excludes优先级>includes优先级

默认情况下，ES查询时返回所有字段的，但是有时，我们只想返回个别字段，或者不想返回某几个字段，这个时候就可以用到_source_includes和_source_excludes。
从字面上看_source_includes就是包含的字段，_source_excludes就是屏蔽的字段。

1. 造点测试数据

PUT /pigg_test/_doc/1
{"name": "冬哥","age": 33,"interest": ["music", "food"]
}PUT /pigg_test/_doc/2
{"name": "珣爷","age": 28,"interest": ["music", "sleep"],"about": "I am a tester"
}PUT /pigg_test/_doc/3
{"name": "胖丫","age": 3,"interest": ["food", "sleep"],"about": "I am a girl"
}

2. _source参数

2.1 根据id查询时，只返回_source

先看下默认查询id=1时的返回

GET /pigg_test/_doc/1返回：
{"_index" : "pigg_test","_type" : "_doc","_id" : "1","_version" : 1,"_seq_no" : 0,"_primary_term" : 1,"found" : true,"_source" : {"name" : "冬哥","age" : 33,"interest" : ["music","food"]}
}

再看下加了_source参数的返回

GET /pigg_test/_doc/1/_sourceES版本到7.x后，得这么写
GET /pigg_test/_source/1只是返回了_source里的内容，不返回_index，_type，_version等信息
{"name" : "冬哥","age" : 33,"interest" : ["music","food"]
}

2.2 设置_source=false，则不返回_source

默认情况下_source=true，如果不想返回_source，需要指定_source=false

GET /pigg_test/_doc/1?_source=false返回如下，结果中没有了_source
{"_index" : "pigg_test","_type" : "_doc","_id" : "1","_version" : 1,"_seq_no" : 0,"_primary_term" : 1,"found" : true
}

3. 在请求体中设置_source_includes和_source_excludes

3.1 _source_includes:只返回部分字段

GET pigg_test/_search
{"query": {"term": {"interest": {"value": "food"}}},"_source": {"includes": ["name", "interest"]}
}

返回的_source中只包含 “music”, “food”

...省略别的信息..."hits" : [{"_index" : "pigg_test","_type" : "_doc","_id" : "1","_score" : 0.4700036,"_source" : {"interest" : ["music","food"],"name" : "冬哥"}},{"_index" : "pigg_test","_type" : "_doc","_id" : "3","_score" : 0.4700036,"_source" : {"interest" : ["food","sleep"],"name" : "胖丫"}}]

3.2 如果只是_source_includes可以简写如下


GET pigg_test/_search?_source=false
{"query": {"term": {"interest": {"value": "food"}}},"_source": ["name", "interest"]
}

3.3 _source_excludes：屏蔽部分字段

GET pigg_test/_search
{"query": {"term": {"interest": {"value": "food"}}},"_source": {"excludes": ["age", "about", "interest"]}
}

返回结果中，_source就屏蔽了"age", “about”, “interest”

...省略别的信息..."hits" : [{"_index" : "pigg_test","_type" : "_doc","_id" : "1","_score" : 0.4700036,"_source" : {"name" : "冬哥"}},{"_index" : "pigg_test","_type" : "_doc","_id" : "3","_score" : 0.4700036,"_source" : {"name" : "胖丫"}}]

3.4 都有时，excludes优先级>includes优先级

GET pigg_test/_search
{"query": {"term": {"interest": {"value": "food"}}},"_source": {"includes": ["interest", "name"],"excludes": ["interest", "about"]}
}

includes包含了interest，但excludes也包含了excludes。
返回结果中只有name。

...省略别的信息...
"hits" : [{"_index" : "pigg_test","_type" : "_doc","_id" : "1","_score" : 0.4700036,"_source" : {"name" : "冬哥"}},{"_index" : "pigg_test","_type" : "_doc","_id" : "3","_score" : 0.4700036,"_source" : {"name" : "胖丫"}}]

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