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This version of the OpenSearch documentation is no longer maintained. For the latest version, see the current documentation. For information about OpenSearch version maintenance, see Release Schedule and Maintenance Policy.

Go client

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


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

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 (
    opensearch ""
    opensearchapi ""
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)

    // Print OpenSearch version information on console.

    // 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)

    // 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)

    // 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)
    fmt.Println("deleting document")

    // 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)
    fmt.Println("deleting index", deleteIndexResponse)