Sync like file transfer with v0.14

fluent.conf

<source>
  @type tail
  path in/*.log
  path_key tailed_path
  read_from_head true
  tag logs.tail

  <parse>
    @type none
  </parse>
</source>

<filter logs.tail>
  @type record_transformer
  enable_ruby true
  <record>
    # overwrite full path to file name
    tailed_path ${File.basename(record["tailed_path"])}
  </record>
</filter>

<match logs.tail>
  @type file
  path out/${tailed_path}
  append true
  add_path_suffix false

  <buffer time,tailed_path>
    flush_at_shutdown true
  </buffer>
  <format>
    @type single_value
  </format>
</match>