code: func (tmp *TieredMergePolicy) SetForceMergeDeletesPctAllowed(v float64) *TieredMergePolicy {
  	assert2(v >= 0 && v <= 100, fmt.Sprintf("forceMergeDeletesPctAllowed must be between 0 and 100 inclusive (got %v)", v))
  	tmp.forceMergeDeletesPctAllowed = v
  	return tmp
  }
docs: /*
  When forceMergeDeletes is called, we only merge away a segment if its
  delete percentage is over this threshold. Default is 10%.
  */