How to enable hot refresh of freemarker templates in spring boot?

I'm looking for enabling hot refresh of ftl files on spring boot framework, so that changes on ftl files need not require application restart. I had tried following settings through application.properties,

spring.freemarker.cache=false
spring.freemarker.template_update_delay=0

but yet still not getting to it.

How can I enable it through application properties?

thanks!