Change process kill order for testclusters shutdown #50215
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The testclusters shutdown code was killing child processes of the ES JVM before the ES JVM. This causes any running ML jobs to be recorded as failed, as the ES JVM notices that they have disconnected from it without being told to stop, as they would if they crashed. In many test suites this doesn't matter because the test cluster will never be restarted, but in the case of upgrade tests it makes it impossible to test what happens when an ML job is running at the time of the upgrade. This change reverses the order of killing the ES process tree such that the parent processes are killed before their children. A list of children is stored before killing the parent so that they can subsequently be killed (if they don't exit by themselves as a side effect of the parent dying). Backport of elastic#50175
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The testclusters shutdown code was killing child processes
of the ES JVM before the ES JVM. This causes any running
ML jobs to be recorded as failed, as the ES JVM notices that
they have disconnected from it without being told to stop,
as they would if they crashed. In many test suites this
doesn't matter because the test cluster will never be
restarted, but in the case of upgrade tests it makes it
impossible to test what happens when an ML job is running
at the time of the upgrade.
This change reverses the order of killing the ES process
tree such that the parent processes are killed before their
children. A list of children is stored before killing the
parent so that they can subsequently be killed (if they
don't exit by themselves as a side effect of the parent
dying).
Backport of #50175