/** <code>metadata.max.idle.ms</code> */
public static final String METADATA_MAX_IDLE_MS_CONFIG = "metadata.max.idle.ms";
private static final String METADATA_MAX_IDLE_MS_DOC =
        "Controls how long the producer will cache metadata for a topic that's idle. If the elapsed " +
        "time since a topic was last produced to exceeds the metadata idle duration, then the topic's " +
        "metadata is removed from the cache and the next access to it will force a metadata fetch request.";

...
    .define(METADATA_MAX_IDLE_MS_CONFIG,
            Type.LONG,
            5 * 60 * 1000,
            atLeast(5000),
            Importance.LOW,
            METADATA_MAX_IDLE_MS_DOC)