how to filter a message with filter processor based on log body ( not by attributes or resources)

[kumachop2]

Ex: 172.20.12.7 - - [01/Jul/2022:20:12:54 +0000] "HEAD / HTTP/1.1" 200 0 "-" "Edge Health Probe" "-" - Looking for way to exclude this message

[jtama]

Using operator filter ?

- type: filter
  expr: 'body.message not(matches "Edge Health Probe")'
  output: my_output