The property was deprecated in 2.3.x (see https://github.com/spring-projects/spring-boot/issues/19673) and has now been removed in 2.5.x. This means that we have a test in 2.5.x that is setting a property that no longer has any effect. We should update the tests in 2.3.x and later so we're not using a deprecated/removed property.
Comment From: snicoll
spring.data.cassandra.read-timeout is affected the same way.