code: func (s *UserService) Find(property string, tweaks ...userSearchF) ([]User, *Response, error) {
  	search := []userSearchParam{
  		{
  			name:  "username",
  			value: property,
  		},
  	}
  	for _, f := range tweaks {
  		search = f(search)
  	}
  
  	var queryString = ""
  	for _, param := range search {
  		queryString += param.name + "=" + param.value + "&"
  	}
  
  	apiEndpoint := fmt.Sprintf("/rest/api/2/user/search?%s", queryString[:len(queryString)-1])
  	req, err := s.client.NewRequest("GET", apiEndpoint, nil)
  	if err != nil {
  		return nil, nil, err
  	}
  
  	users := []User{}
  	resp, err := s.client.Do(req, &users)
  	if err != nil {
  		return nil, resp, NewJiraError(resp, err)
  	}
  	return users, resp, nil
  }
docs: // Find searches for user info from JIRA:
  // It can find users by email, username or name
  //
  // JIRA API docs: https://docs.atlassian.com/jira/REST/cloud/#api/2/user-findUsers