code: func main() {
  
  	// init a connection
  	s, err := solr.Init("localhost", 8983, "collection-name")
  
  	if err != nil {
  		fmt.Println(err)
  		return
  	}
  
  	// build an update document, in this case removing two documents
  	f := map[string]interface{}{
  		"delete": map[string]interface{}{
  			"id": 22,
  		},
  	}
  
  	// send off the update (2nd parameter indicates we also want to commit the operation)
  	resp, err := s.Update(f, true)
  
  	if err != nil {
  		fmt.Println("error =>", err)
  	} else {
  		fmt.Println("resp =>", resp)
  	}
  }
docs: /*
   * README
   * ------
   * This example shows an update (delete) Query being performed. An update (delete) document
   * is built and sent off to Solr.
   */