docs: @Override
      public void close() throws VoldemortException {
          logger.debug("Close called for read-only store.");
          this.fileModificationLock.writeLock().lock();
  
          try {
              if(isOpen) {
                  this.isOpen = false;
                  fileSet.close();
              } else {
                  logger.debug("Attempt to close already closed store " + getName());
              }
          } finally {
              this.fileModificationLock.writeLock().unlock();
          }
      }