es_deprecation.log - started from binary - contains a json log line with
type deprecation

es_docker_happy_startup.log - started from docker - successful
elasticsearch startup

es_docker_startup_and_deprecation.log - started from docker - log lines
containing successful startup (type main) mixed with log line of type
deprecation

es_docker_startup_bootstrap_fail.log - started from docker - log lines
from startup failing due to bootstrap fail (not a json in docker)

es_happy_startup.log - started from binary - successful elasticsearch
startup

es_startup_failure_boostrap.log - started from binary - elasticsearch
failing to start due to bootstrap failure

es_startup_shutdown_due_to_exception.log - logs from DieWithDignity
where elasticsearch fail to start due to exception

es_json_logs_tests.log - logs from a junit test - mix of logs with:
- stacktrace with a cause
- stacktrace with exception message as json
- message with json
- messages with multiple logger level

main ->server