Hands-On Software Engineering with Golang

Updating the PageRank score for a document

To update the PageRank score for an existing document, we need to construct an update request payload that the go-elastic client will submit to the Elasticsearch cluster via an HTTP POST request. The update payload includes a map with the fields names and values that need to be updated.

To facilitate document updates, the go-elastic client exposes an Update method that expects the following set of arguments:

• The name of the index that contains the document to be updated
• The ID of the document to be updated
• The document update payload encoded as JSON

The following code snippet illustrates how the update request is assembled and passed to the Update method:

var buf bytes.Buffer
update := map[string ...