Seem like something changed in 2.4.x that means we now have POMs uploaded to maven central. See https://repo1.maven.org/maven2/org/springframework/boot/spring-boot-docs/2.4.2/
Comment From: garyrussell
Looks like the change was in 2.3.x; earlier versions published the whole module including jar and sources https://repo1.maven.org/maven2/org/springframework/boot/spring-boot-docs/2.2.9.RELEASE/
Comment From: wilkinsona