Github user sebbASF commented on the issue:
https://github.com/apache/incubator-ponymail/issues/313
AIUI this is only possible with ES 5.x; previously such settings were done
externally.
So in order to implement this, ES 5.x must be made a pre-condition, which
is not the case at present.
IMO the defaults should be values that are suitable for test installations.
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