Outdated Java Example in the multiline plugin documentation

[max-nazarati]

Describe the bug

In the multiline plugin documentation, the Java log example seems to be out of date (at least to my understanding).

The documentation says, that the example log is supposed to produce multiple fluentd records. This appears to be outdated information, currently, with a setup very similar to that example, I get a single fluentd record with a message field that contains a multiline string.

Link to the problematic documentation

https://docs.fluentd.org/parser/multiline#java-stacktrace-log

Expected explanation

If this is, indeed, an issue I expect that the example in the documentation will be updated to show that only a single fluentd record is produced, with a multiline message string

Additional context

No response