bootstrap.yml

spring:
  application:
    name: spring-cloud-vault
  cloud:
    vault:
      token: s.lL1wRFK79QQQRflLyIS3WyYm
      scheme: http
      host: http://127.0.0.1
      port: 8200

# custom property (appSecurityKey) which would be fetched from vault server and assigned to app.security.key. You can configure this in application.yml too. 
# it is not mandatory to be present inside bootstrap.yml
app:
  security:
    key: ${appSecurityKey}