code: public Date getExpirationDate(ApplicationDefinition appDef, String shard) {
          checkServiceState();
          return m_olap.getExpirationDate(appDef, shard);
      }
docs: Get the expire-date for the given shard name and OLAP application. Null is returned
  if the shard does not exist or has no expire-date.
  
  @param appDef        OLAP application definition.
  @param shard         Shard name.
  @return              Shard's expire-date or null if it doesn't exist or has no
  expire-date.