code: func (q *Query) IsEmpty() bool {
  	if q.index != "" {
  		return false
  	}
  	if len(q.fieldCriteria) != 0 {
  		return false
  	}
  
  	if q.ors != nil {
  		return false
  	}
  
  	return true
  }
docs: // IsEmpty returns true if the query is an empty query
  // an empty query matches against everything