code: def ft_addhash redis_key:
        REDI_SEARCH.call('FT.ADDHASH', @index_name, redis_key, @score, 'REPLACE')
      rescue Exception => e
        Rails.logger.error e if defined? Rails
        return e.message
      end
docs: index existing Hash
  
   @param record [string] key of existing HASH key in Redis that will hold the fields the index needs.
   @return [String]