ScriptDocValues getDate() on long field triggers AccessControlException

[rjernst]

In #22948 we added a deprecation warning when using .date on a long field. However, since scripts run in a reduced permission environment, the underlying call to log the message results in a security manager exception. We need to do this in a doPrivileged block.

See https://discuss.elastic.co/t/painless-script-appender-deprecation-rolling-java-security-accesscontaccess-denied/117313

[rjernst]

cc @nik9000

[nik9000]

Eep. This is a pretty terrible bug. I'll take a look at it soon-ish. There are 5 or 6 things ahead of it in my TODO list but I'll see about bumping it up.

[nik9000]

I had a look at this. I can't reproduce it, but from the stacktrace in the discuss post it looks like this isn't an "all the time" thing. It looks like this is triggered when log4j goes digging around in the filesystem which it doesn't do all the time. I'm going to open a PR that goes under the assumption that this is caused by that.

[nik9000]

OK. I can reproduce "something" happening locally. If I leave the code as is it can break file rolling. But instead of failing the request the line fails to log. I can fix that with the fix that, I think, should fix this issue.