Why I can see the complete stack trace in logs?

I'm using Elasticsearch 2.3.x in an application. Sometimes, I see logs like this:
java.lang.ClassCastException
[2016-11-17 00:00:30,176][WARN ][index.warmer ] [172.16.131.181-avos] [logs-2016-11-16-23][0] warmer [warmer_av_h
istogram_ts_1479340799999_90] failed
java.lang.ClassCastException
[2016-11-17 00:00:30,176][WARN ][index.warmer ] [172.16.131.181-avos] [logs-2016-11-16-23][0] warmer [warner_av_a
gg_ts_1479340799999_180] failed
java.lang.ClassCastException
[2016-11-17 00:00:30,176][WARN ][index.warmer ] [172.16.131.181-avos] [logs-2016-11-16-23][0] warmer [warmer_av_h
istogram_ts_1479340799999_180] failed
java.lang.ClassCastException

I know, warmers are deprecated, but I don't know what settings I have to put in logging.yml to show the full stack trace.

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