Set Mixed Environment Variable in Config

[briandannenmueller]

Is it possible to insert the environment variable into a path in the config file?

I am using Fluentd version 1.13.3 with the following source block:
`
@type tail
path /fluentd/logs/"#{ENV['LOG_FILE']}"
pos_file /fluentd/log/"#{ENV['LOG_FILE']}".pos
...

`

LOG_FILE has been set as "test.log". While I have confirmed that this environment variable is in place, the source block does not seem to be inserting the file name into the path and pos_file. The tail plugin works when it is hard coded in, and ceases to work (with no indication of logs that anything is amiss) if I use the environment reference. We require that the path and pos_file be a combination of a default path with a varying file name. Is there a special syntax that I need to use to make this work?