public CachingTableDescriptor<K, V> withWriteTtl(Duration writeTtl) {
    this.writeTtl = writeTtl;
    return this;
  }
Specify the TTL for each write access, ie. record is expired after
the TTL duration since last write access of each key.
@param writeTtl write TTL
@return this descriptor
samza-api/src/main/java/org/apache/samza/table/descriptors/CachingTableDescriptor.java