Process multiline logs from multiple docker images (multiple hosts)

How to configure ELK to display one string per printstacktrace Exception, that it does not lead to a mixture of streams and corrupted event data (safe threads).

Now stacktrace in Kibana is splitted into multiple lines.
My Logstash conf:
input {
gelf {}
output {
elasticsearch {
hosts => ["elasticsearch"]
index => "myApplication-%{+YYYY.MM.dd}"
stdout { }

The general recommendation is to perform any kind of multiline processing as close to the source as possible. What does you ingest process look like? What collects the data in the first place?

My applications run inside five container dockers and send logs to stdout. GELF driver in the docker redirects these messages to logstash.
I found this article
This article did not help me.
How can this problem be solved?

Then ideally the gelf driver should handle multi line processing, but I am not familiar with this.

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