1. postman 请求elasticsearch 返回指定字段
1.直接在请求体当中，json 数据，对应的是一个列表
{
"_source":['title','id','desc'],
"from":10,
"size":100,
}
至于from和size是浅分页
2. 或者这样
{ "_source":{ "includes":["title","url","id"], "excludes":["desc"] } }
其中includes代表需要返回的字段，excludes代表不要返回的字段
3.直接在请求url带上需要查询参数
curl -XGET 'localhost:9200/_search?pretty&filter_path=took,hits.hits._id,hits.hits._score'
{ "took" : 3, "hits" : { "hits" : [ { "_id" : "3640", "_score" : 1.0 }, { "_id" : "3642", "_score" : 1.0 } ] } }
对_source的字段进行过滤
curl -XGET 'localhost:9200/_search?pretty&filter_path=hits.hits._source&_source=title'
{ "hits" : { "hits" : [ { "_source":{"title":"Book #2"} }, { "_source":{"title":"Book #1"} }, { "_source":{"title":"Book #3"} } ] } }
这样也可以
_search?_source=goodsId,uri
_search?fields=goodsId,uri
2.python 对接elassearch ，指定返回字段
1.实例化的es客户端，然后调用search方法，传入参数，params
from elasticsearch import Elasticsearch
es=Elasticseach(xxxx) es.search(params={"_source":"title,id,desc,url"})
注：这边调用的是包中的search方法，和postman不一样的是，_source的值是一个z字符串，不同字段用逗号隔开，而post满是一个列表
2.也是调用Elasticsearch的search方法，传入参数不是param，而直接是_source字段
pprint(es.search(index='person', body={"query": {"match": {"age": "19"}}}, _source=['name']))
结果：
{'_shards': {'failed': 0, 'skipped': 0, 'successful': 1, 'total': 1},
'hits': {'hits': [{'_id': 'xFznIXIBMTX0DMkCyicV',
'_index': 'person',
'_score': 1.0,
'_source': {'name': 'lisi'},
'_type': 'male'}],
'max_score': 1.0,
'total': {'relation': 'eq', 'value': 1}},
'timed_out': False,
'took': 1}
3.不懂直接查询api接口
https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-get.html
4.返回文档版本字段
GET /_search { "version": true, "query" : { "term" : { "user" : "kimchy" } } }
5.Script Field 用脚本来对命中的每个文档的字段进行运算后返回
GET /bank/_search { "query": { "match_all": {} }, "script_fields": { "test1": { "script": { "lang": "painless", "source": "doc['balance'].value * 2" } }, "test2": { "script": { "lang": "painless", <!-- doc指文档--> "source": "doc['age'].value * params.factor", "params": { "factor": 2 } } } }}
搜索结果：
{ "took": 3, "timed_out": false, "_shards": { "total": 5, "successful": 5, "skipped": 0, "failed": 0 }, "hits": { "total": 1000, "max_score": 1, "hits": [ { "_index": "bank", "_type": "_doc", "_id": "25", "_score": 1, "fields": { "test1": [ ], "test2": [ ] } }, { "_index": "bank", "_type": "_doc", "_id": "44", "_score": 1, "fields": { "test1": [ ], "test2": [ ] } } } ] } }
示例2
GET /bank/_search { "query": { "match_all": {} }, "script_fields": { "ffx": { "script": { "lang": "painless", "source": "doc['age'].value * doc['balance'].value" } }, "balance*2": { "script": { "lang": "painless", "source": "params['_source'].balance*2" } } } }
搜索结果：
{ "took": 26, "timed_out": false, "_shards": { "total": 5, "successful": 5, "skipped": 0, "failed": 0 }, "hits": { "total": 1000, "max_score": 1, "hits": [ { "_index": "bank", "_type": "_doc", "_id": "25", "_score": 1, "fields": { "balance*2": [ ], "ffx": [ ] } }, { "_index": "bank", "_type": "_doc", "_id": "44", "_score": 1, "fields": { "balance*2": [ ], "ffx": [ ] } }, } ] } }
说明： params _source 取 _source字段值
官方推荐使用doc，理由是用doc效率比取_source 高
package com.query.test;
import java.net.InetAddress;
import org.elasticsearch.action.search.SearchRequestBuilder;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.InetSocketTransportAddress;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.MatchPhraseQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.transport.client.PreBuiltTransportClient;
import org.junit.Test;
import com.es.allpeizhi.EsAll;
/**
* 文件名 ： ElasticSearchBulkIn.java
* 包 名 ：
* 描 述 ： 过滤字段查询,指定返回字段数据
* 机能名称：
* 技能ID ：
* 作 者 ： smkj
* 版 本 ： V1.0
*/
public class searchGuolv {
@Test
public static void main(String[] args) throws Exception {
EsAll esall = new EsAll();
// 查询关键字
String searchName = "重庆市政府采购网";
Long nowTime = System.currentTimeMillis();
InetSocketTransportAddress node = new InetSocketTransportAddress(InetAddress.getByName(esall.host), esall.prot);
// 配置settiong
Settings settings = Settings.builder().put("cluster.name", "my-application").build();
TransportClient client = new PreBuiltTransportClient(settings);
client.addTransportAddress(node);
System.out.println("ES--ip地址:" + node.getAddress());
String index = esall.IndexName;
String type = esall.TypeName;
// 指定要返回的字段
String[] fields = new String[1];
fields[0] = "TITLE"; // 字段1名称
// 构造query
SearchRequestBuilder requestBuilder = client.prepareSearch(index);
// setFields 2.x版本
requestBuilder.setFrom(0).setSize(10).setTimeout(TimeValue.timeValueMillis(10)).setTypes(type).setFetchSource(fields, null);// 排除字段null
;
// bool 条件
// BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
// MatchPhraseQueryBuilder tqb = QueryBuilders.matchPhraseQuery("DISPLAY_CONTENT", keword);
BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
MatchPhraseQueryBuilder tqb = QueryBuilders.matchPhraseQuery("DISPLAY_CONTENT", searchName);
boolQueryBuilder.must(tqb);
// set query
requestBuilder.setQuery(boolQueryBuilder);
// get response
SearchResponse response = requestBuilder.execute().actionGet();
// 遍历返回的字段
SearchHits searchHits = response.getHits();
// List<String> id = new ArrayList<>();
for (SearchHit hit : searchHits) {
System.out.println(hit.getSource().get("TITLE"));
// System.out.println(hit.getFields().get("TITLE").getValue().toString());//2.x版本
}
client.close();
System.out.println("命中总数量：" + response.getHits().getTotalHits());
// System.out.println(id.size());
System.out.println("耗时：" + (System.currentTimeMillis() - nowTime) / 1000 + "秒");
}
}
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来源：oschina
链接：https://my.oschina.net/xiaominmin/blog/4333589