code: func (f *FilterOp) Term(field string, value interface{}) *FilterOp {
  	if len(f.TermMap) == 0 {
  		f.TermMap = make(map[string]interface{})
  	}
  
  	f.TermMap[field] = value
  	return f
  }
docs: // Term will add a term to the filter.
  // Multiple Term filters can be added, and ES will OR them.
  // If the term already exists in the FilterOp, the value will be overridden.