SpringApplication's convertEnvironment(ConfigurableEnvironment) method was deprecated in 2.5.8 for removal in 2.7.0. The changes were merged forwards into 2.6.x and included in the 2.6.3 release. This means that the undeprecated method was available in 2.6.2. To give early adopters of 2.6.x two minor releases to adjust to the deprecation, I don't think it should be removed until 2.8.0.
Comment From: philwebb
For this one we'll leave convertEnvironment as it is since it's such an internal method that hopefully nobody is using it.
Comment From: wilkinsona
I have updated https://github.com/spring-projects/spring-boot/wiki/Deprecations.