def ft_info
      REDI_SEARCH.call('FT.INFO', @index_name)
    rescue Exception => e
      Rails.logger.error e if defined? Rails
      return e.message
    end
def ft_info
      REDI_SEARCH.call('FT.INFO', @index_name)
    rescue Exception => e
      Rails.logger.error e if defined? Rails
      return e.message
    end
get info about specific index

 @return [String]