Make mdc properties top-level attributes in decanter elasticsearch appender

[dschulten <di...@escalon.de>]

Decanter produces mdc attributes as a nested structure. The behaviour in the
official  Elasticsearch ecs json format
<https://github.com/elastic/ecs-logging-java>    and with the 
logstash-logback-encoder
<https://github.com/logstash/logstash-logback-encoder>   is different: the
mdc attributes become top-level fields.

I have found the behaviour of decanter only on the
https://github.com/vy/log4j2-logstash-layout.

Is it possible to pull up the mdc fields so that they become top-level
attributes?

A workaround would of course be to put logstash in front of Elasticsearch,
but I would rather avoid that.

Cheers,
Dietrich





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