Query syntax

Hi, guys!
I have one problem - I can't understand how elastic's queries works.
I want to find logs using "file" field. It's worked only if I press plus on this field with key (path to file), but when I put it to search using hands - it didn't work.
Can anyone show me my mistake?

Here is full post with screens: https://github.com/elastic/kibana/issues/4937

Thanks, a lot,

Sorry about the delay in the response. It looks like it should work...

What are your ES mappings for your file field? What Kibana version and OS/browser version are you using?