请问下哪位大佬使用过 github.com/olivere/elastic 包操作ElasticSearch的吗？

Question

query := elastic.NewTermQuery("category_id",categoryId)
result, e := ES.GetEs().Search().Index("group_category").Type("_doc").Query(query).Sort("img_date",false).Do(context.Background())

这样搜索是把所有字段都返回了， 我想只返回指定的字段，应该怎么设置呢？ 比如我只想返回 id这个字段， 求各位大佬指导指导！

Answer 1

package main

import (
    "fmt"
    "github.com/olivere/elastic"
    "golang.org/x/net/context"
)

func main() {
    client, err := elastic.NewClient(
        elastic.SetURL("your es"),
    )
    if err != nil {
        // Handle error
    }

    fsc := elastic.NewFetchSourceContext(true).Include("field1", "field12") //.Exclude("*.description")
    query := elastic.NewTermQuery("category_id", 1)

    result, err := client.Search().
        Index("yourindex").
        Type("yourtype").
        Query(query).
        FetchSourceContext(fsc).
        Sort("img_date", false).
        Pretty(true).
        Do(context.Background())
    if err != nil {
        panic(err)
    }

    for i, r := range result.Hits.Hits {
        fmt.Println(i, string(*r.Source))
    }
}