How to Update a Record in ElasticSearch Using olivere/elastic in Go?

When working with ElasticSearch, updating records is often necessary. The olivere/elastic package for Go offers a comprehensive set of features for interacting with ElasticSearch, including record updates.

Partial Record Update Using UPDATE API

Partial record updates allow for modifications to specific fields within a document. Olivere/elastic provides the Update method to facilitate partial updates. The following code snippet demonstrates how to update a single field ("name") using the UPDATE API.

update, err := client.Update().
  Index("test3").
  Type("user").
  Id("2").
  Doc(map[string]interface{}{"name": "Updated Name"}).
  Do()

if err != nil {
  // Handle error
}

fmt.Println("updated id: ", update.Id)

Alternative Approach (Not Working)

An alternative approach to partial updates uses the Script method. However, this approach has been reported to be ineffective. The following example illustrates the attempted alternative approach.

update := client.Update().
  Index("test3").
  Type("user").
  Id("2").
  Script(elastic.NewScript("ctx._source.name = name").
    Params(map[string]interface{}{"name": "Updated Name"}).
    Lang("groovy"))

fmt.Println("updated id: ", update.Id)

By employing the Update method and Doc to specify the updated field, you can effectively update records in ElasticSearch using olivere/elastic in Go.