gem install fluent-plugin-exclude-filter

<match test.**>
  type exclude_filter
  key hoge
  value 100
  regexp false # default false, string comparison
  add_tag_prefix debug
</match>  

test.aa: {"json":"dayo"}
test.aa: {"hoge":"100"}

debug.test.aa: {"json":"dayo"} 

<match test.**>
  type exclude_filter
  file_path path/to/test.yml 
  regexp true # default false
  add_tag_prefix debug
</match>  

hoge: 100
moge:
  - ^aaa
  - bbb

test.aa: {"json":"dayo"}
test.aa: {"hoge":"100"}
test.aa: {"hoge":"200"}
test.aa: {"moge":"aaa bbb"}
test.aa: {"moge":"aaa ccc"}
test.aa: {"moge":"ccc ddd"}

debug.test.aa: {"json":"dayo"} 
debug.test.aa: {"hoge":"200"}
debug.test.aa: {"moge":"ccc ddd"}

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