[7.x][ML] Use unique named pipes for data frame analytics (#70918) #70926
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When a data frame analytics job is stopped because of
a call to the _stop API, if the process is running it is killed.
Depending on the OS, it may take some time to delete all the
used named pipes. This means that in a scenario where the job
is restarted immediately after it is possible that the old
named pipes are used which results to the new process not
properly communicating with java.
This has been the underlying issue of #70698 and #67581.
This commit fixes it by using unique identifiers for the named
pipes.
Closes #70698
Backport of #70918