opensearch-docs-cn/_clients/go.md

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Go client

The OpenSearch Go client lets you connect your Go application with the data in your OpenSearch cluster.

Setup

If you're creating a new project:

go mod init

To add the client to your project, import it like any other module:

go get github.com/opensearch-project/opensearch-go

Sample code

This sample code creates a client, adds an index with non-default settings, inserts a document, searches for the document, deletes the document, and finally deletes the index:

package main
import (
    "os"
    "context"
    "crypto/tls"
    "fmt"
    opensearch "github.com/opensearch-project/opensearch-go"
    opensearchapi "github.com/opensearch-project/opensearch-go/opensearchapi"
    "net/http"
    "strings"
)
const IndexName = "go-test-index1"
func main() {
    // Initialize the client with SSL/TLS enabled.
    client, err := opensearch.NewClient(opensearch.Config{
        Transport: &http.Transport{
            TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
        },
        Addresses: []string{"https://localhost:9200"},
        Username:  "admin", // For testing only. Don't store credentials in code.
        Password:  "admin",
    })
    if err != nil {
        fmt.Println("cannot initialize", err)
        os.Exit(1)
    }

    // Print OpenSearch version information on console.
    fmt.Println(client.Info())

    // Define index mapping.
    mapping := strings.NewReader(`{
     'settings': {
       'index': {
            'number_of_shards': 4
            }
          }
     }`)

    // Create an index with non-default settings.
    res := opensearchapi.CreateRequest{
        Index: IndexName,
        Body:  mapping,
    }
    fmt.Println("creating index", res)

    // Add a document to the index.
    document := strings.NewReader(`{
        "title": "Moneyball",
        "director": "Bennett Miller",
        "year": "2011"
    }`)

    docId := "1"
    req := opensearchapi.IndexRequest{
        Index:      IndexName,
        DocumentID: docId,
        Body:       document,
    }
    insertResponse, err := req.Do(context.Background(), client)
    if err != nil {
        fmt.Println("failed to insert document ", err)
        os.Exit(1)
    }
    fmt.Println(insertResponse)

    // Search for the document.
    content := strings.NewReader(`{
       "size": 5,
       "query": {
           "multi_match": {
           "query": "miller",
           "fields": ["title^2", "director"]
           }
      }
    }`)

    search := opensearchapi.SearchRequest{
        Body: content,
    }

    searchResponse, err := search.Do(context.Background(), client)
    if err != nil {
        fmt.Println("failed to search document ", err)
        os.Exit(1)
    }
    fmt.Println(searchResponse)

    // Delete the document.
    delete := opensearchapi.DeleteRequest{
        Index:      IndexName,
        DocumentID: docId,
    }

    deleteResponse, err := delete.Do(context.Background(), client)
    if err != nil {
        fmt.Println("failed to delete document ", err)
        os.Exit(1)
    }
    fmt.Println("deleting document")
    fmt.Println(deleteResponse)

    // Delete previously created index.
    deleteIndex := opensearchapi.IndicesDeleteRequest{
        Index: []string{IndexName},
    }

    deleteIndexResponse, err := deleteIndex.Do(context.Background(), client)
    if err != nil {
        fmt.Println("failed to delete index ", err)
        os.Exit(1)
    }
    fmt.Println("deleting index", deleteIndexResponse)
}