in lib/fluent/plugin/kinesis_helper/format.rb [33:42]
def data_format(tag, time, record)
if @data_key and record[@data_key].nil?
raise KeyNotFoundError.new(@data_key, record)
elsif @data_key
record[@data_key].to_s
else
@formatter.format(tag, time, record).chomp
end
end