code: func (c *Conn) OptimizeIndices(args map[string]interface{}, indices ...string) (ExtendedStatus, error) {
  	var retval ExtendedStatus
  	var optimizeUrl string = "/_optimize"
  	if len(indices) > 0 {
  		optimizeUrl = fmt.Sprintf("/%s%s", strings.Join(indices, ","), optimizeUrl)
  	}
  
  	body, err := c.DoCommand("POST", optimizeUrl, args, nil)
  	if err != nil {
  		return retval, err
  	}
  	if err == nil {
  		// marshall into json
  		jsonErr := json.Unmarshal(body, &retval)
  		if jsonErr != nil {
  			return retval, jsonErr
  		}
  	}
  	return retval, err
  }
docs: // AnalyzeIndices performs the analysis process on a text and return the tokens breakdown of the text.
  // http://www.elasticsearch.org/guide/reference/api/admin-indices-analyze/