Hi, As pointed out in this comment #5539 (comment) <https://github.com/apache/kafka/pull/5539#discussion_r212380648> the object FunctionConversions is only of internal use and therefore should be private to the lib only so that we can do changes without going through KIP like this one.
KIP: https://cwiki.apache.org/confluence/display/KAFKA/KIP-363%3A+Make+FunctionConversions+private Thanks
