code: public static ETAPrinter init(String elementName, long totalElementsToProcess) {
          return init(elementName, totalElementsToProcess, System.out, false);
      }
docs: Initializes a progress bar.
  {@link java.lang.System}.out will be used to print the progress bar.
  
  @param elementName            the name of the elements that are processed. It is used to display the speed.
  @param totalElementsToProcess the total number of items that are going to be processed.
  
  @return the initialized {@link com.vdurmont.etaprinter.ETAPrinter}