In JVM land I look for another language on the JVM. If Scalia, groovy, kotlin haven't piqued the interest of a potential hire then it says a lot about them.
A few years ago it would have a been a nice to have. Now it's actually suspicious if they haven't dabbled!
Mentioning Scala or Kotlin on a CV says something different than mentioning Apache Groovy does. Scala and Kotlin are statically-typed languages designed for creating applications, whereas Groovy is for scripting, e.g. tests and builds.
A few years ago it would have a been a nice to have. Now it's actually suspicious if they haven't dabbled!