Declare the query function using Golang’s func keyword We need this function to ensure that the strings being passed to the Elasticsearch API methods are valid JSON strings for querying Elasticsearch documents. This function returns a valid *strings.Reader object from a string passed to it. In this article, our script will use an example function called constructQuery(). Make a function that can format and build Elasticsearch JSON query strings Import the Elasticsearch library packages "encoding/json" // for encoding and validating JSON strings "strconv" // typecast "size" int as string Use the Kibana UI or the cURL request below to verify that your Elasticsearch cluster is running: To check whether Golang is already installed and these paths are set, use the go version and go env commands in the terminal.Įlasticsearch also needs to be installed on the same node where your Golang scripts will be compiled and run. Let’s review a few important prerequisites that need to be taken care of before proceeding with this tutorial:įirst, Golang needs to be installed in addition, both the $GOPATH and $GOROOT should be set in your bash profile. Prerequisites for the Elasticsearch Golang driver’s API calls In this article, we’ll show how you can use Golang’s built-in packages and JSON encoding library to build valid JSON query strings that can then be passed to Elasticsearch. You’ll need to know how to construct and format these queries in order to search for documents with the go-elasticsearch driver. If you need to get Elasticseearch documents via a Golang script, the queries you construct will be the most important part of your code.
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