The documentation provided by Spring on deploying a Spring Boot application as a Windows Service is a little sparse. Indeed, here it is in full:
Spring Boot application can be started as Windows service using
winsw.A sample maintained separately to the core of Spring Boot describes step-by-step how you can create a Windows service for your Spring Boot application.
— From Spring Boot Reference Guide (version 1.4.3), section 56.2: Microsoft Windows Services
As the official reference guide is lacking detail, here is a step by step guide to building and deploying a Spring Boot application as a Windows Service.