Hmmm, what you have should work.
Could you try enclosing the label keys in double quotes, like so:
labels:
"co.elastic.logs/json.keys_under_root": true
"co.elastic.logs/json.overwrite_keys": true
"co.elastic.logs/json.add_error_key": true
"co.elastic.logs/json.expand_keys": true
If that doesn't work, could you try using the array form for the labels like so:
labels:
- "co.elastic.logs/json.keys_under_root=true"
- "co.elastic.logs/json.overwrite_keys=true"
- "co.elastic.logs/json.add_error_key=true"
- "co.elastic.logs/json.expand_keys=true"
Thanks,
Shaunak