Github user sebbASF commented on the issue:
https://github.com/apache/incubator-ponymail/issues/162
Further checks show that some code does not check if the returned doc is
valid after calling elastic.get()
A better solution would be to add an optional get parameter; if specified
then it will return for 404. Then only code that is expecting a 404 will ever
see one.
The alternative is to always use pcall, but that catches all errors.
It would be better to let these get reported, rather than assuming there
has been a 404.
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