millin opened a new pull request #15163:
URL: https://github.com/apache/airflow/pull/15163
Optional LogRecord attributes cannot be added to log_format due to format
exception.
This happened because ElasticSearch drops keys with null value from record.
Configurations to reproduce:
```
[logging]
remote_logging = True
log_format = [%%(asctime)s] {%%(filename)s:%%(lineno)d} %%(levelname)s -
%%(message)s - %%(exc_text)s
[elasticsearch]
json_format = True
json_fields = asctime, filename, lineno, levelname, message, exc_text
```
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