code: public SortArgs get(String pattern) {
  
          LettuceAssert.notNull(pattern, "Pattern must not be null");
  
          if (get == null) {
              get = new ArrayList<>();
          }
          get.add(pattern);
          return this;
      }
docs: Retrieve external keys during sort. {@literal GET} supports {@code #} and {@code *} wildcards.
  
  @param pattern must not be {@literal null}.
  @return {@code this} {@link SortArgs}.