My log file is generated per day , similar to the file name access-2016-04-17.log、access-2016-04-18.log，How can I write input, read these files can be generic.
You will want to use the file input - https://www.elastic.co/guide/en/logstash/current/plugins-inputs-file.html
If you have other specific questions, please let us know.
should i write absolute path? Does it matter i wirte like this：“path => "/path/to/{+yyyy/MM/dd/hh}.log” ?
Because my log generated daily by date, I need to load different log every day.
See File input plugin | Logstash Reference [8.11] | Elastic
Paths must be absolute and cannot be relative.
Also I don't think we allow variables in the inputs like that, only wildcards.