The programming language that has been chosen is golang.
Download and configure your workspace with latest version of Go and correct environment path.
http://www.wadewegner.com/2014/12/easy-go-programming-setup-for-windows/
http://www.tecmint.com/install-go-in-linux/
On windows:
cd %GOPATH%/src/github.com/ricardo-ch
On Linux:
cd $GOPATH/src/github.com/ricardo-ch
Create the folders "github.com" and "ricardo-ch" if not already created.
Then:
git clone https://github.com/ricardo-ch/elasticsearch-golang
cd elasticsearch-golang
go run main.go