code: func (s *ExtendedStatsBucketAggregation) GapPolicy(gapPolicy string) *ExtendedStatsBucketAggregation {
  	s.gapPolicy = gapPolicy
  	return s
  }
docs: // GapPolicy defines what should be done when a gap in the series is discovered.
  // Valid values include "insert_zeros" or "skip". Default is "insert_zeros".