code: func (m *MultiSearchRequestBuilder) Build() (*MultiSearchRequest, error) {
  	requests := []*SearchRequest{}
  	for _, sb := range m.requestBuilders {
  		searchRequest, err := sb.Build()
  		if err != nil {
  			return nil, err
  		}
  		requests = append(requests, searchRequest)
  	}
  
  	return &MultiSearchRequest{
  		Requests: requests,
  	}, nil
  }
docs: // Build builds and return a multi search request