code: func (c *Client) DeleteField(field *Field) error {
  	span := c.tracer.StartSpan("Client.DeleteField")
  	defer span.Finish()
  
  	path := fmt.Sprintf("/index/%s/field/%s", field.index.name, field.name)
  	_, _, err := c.httpRequest("DELETE", path, nil, nil, false)
  	return err
  }
docs: // DeleteField deletes a field on the server.