code: @CliObjectOption(description = "Sets the period for which articles should be pulled in ISO time format (e.g. P2D, PT1H)")
    public EmbeddedWikipediaExample lookback(String isoLookback) {
      this.setConfiguration(WikipediaExtractor.BOOTSTRAP_PERIOD, isoLookback);
      return this;
    }
docs: Set bootstrap lookback, i.e. oldest revision to pull.