code: public AwsSecurityFindingFilters withThreatIntelIndicatorLastObservedAt(DateFilter... threatIntelIndicatorLastObservedAt) {
          if (this.threatIntelIndicatorLastObservedAt == null) {
              setThreatIntelIndicatorLastObservedAt(new java.util.ArrayList<DateFilter>(threatIntelIndicatorLastObservedAt.length));
          }
          for (DateFilter ele : threatIntelIndicatorLastObservedAt) {
              this.threatIntelIndicatorLastObservedAt.add(ele);
          }
          return this;
      }
docs: <p>
  The date/time of the last observation of a threat intel indicator.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setThreatIntelIndicatorLastObservedAt(java.util.Collection)} or
  {@link #withThreatIntelIndicatorLastObservedAt(java.util.Collection)} if you want to override the existing
  values.
  </p>
  
  @param threatIntelIndicatorLastObservedAt
  The date/time of the last observation of a threat intel indicator.
  @return Returns a reference to this object so that method calls can be chained together.