With Kafka 0.8.1.1, how do I change the log retention time while it&#39;s running? The [documentation][1] says the property is `log.retention.hours`, but trying to change it using `kafka-topics.sh` returns this error

    $ bin/kafka-topics.sh --zookeeper zk.yoursite.com --alter --topic as-access --config topic.log.retention.hours=24
    Error while executing topic command requirement failed: Unknown configuration &quot;topic.log.retention.hours&quot;.
    java.lang.IllegalArgumentException: requirement failed: Unknown configuration &quot;topic.log.retention.hours&quot;.
    	at scala.Predef$.require(Predef.scala:145)
    	at kafka.log.LogConfig$$anonfun$validateNames$1.apply(LogConfig.scala:138)
    	at kafka.log.LogConfig$$anonfun$validateNames$1.apply(LogConfig.scala:137)
    	at scala.collection.Iterator$class.foreach(Iterator.scala:631)
    	at scala.collection.JavaConversions$JEnumerationWrapper.foreach(JavaConversions.scala:479)
    	at kafka.log.LogConfig$.validateNames(LogConfig.scala:137)
    	at kafka.log.LogConfig$.validate(LogConfig.scala:145)
    	at kafka.admin.TopicCommand$.parseTopicConfigsToBeAdded(TopicCommand.scala:171)
    	at kafka.admin.TopicCommand$$anonfun$alterTopic$1.apply(TopicCommand.scala:95)
    	at kafka.admin.TopicCommand$$anonfun$alterTopic$1.apply(TopicCommand.scala:93)
    	at scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:57)
    	at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:43)
    	at kafka.admin.TopicCommand$.alterTopic(TopicCommand.scala:93)
    	at kafka.admin.TopicCommand$.main(TopicCommand.scala:52)
    	at kafka.admin.TopicCommand.main(TopicCommand.scala)

  [1]: http://kafka.apache.org/documentation.html#brokerconfigs

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changing kafka retention period during runtime