Fix timezone parsing in Rabbitmq logs

[jsoriano]

Similar to #13308, part of #13877.

[kaiyan-sheng]

LGTM

[jsoriano]

jenkins, test this again please

[leweafan]

@jsoriano I see that ingest pipeline is using DATESTAMP which means date format dd-mm-yyyy or mm-dd-yyyy but it's not a case for test.log (2019-04-03 11:13:15.076) also I see that used timestamp format yy-mm-dd which also is not a case for DATESTAMP.
How is it possible that tests passed successful?

[jsoriano]

@leweafan good catch. I have tried this pipeline, without removing the timestamp field, and I see that it works by chance, it is capturing the datestamp as:

"timestamp": "19-04-03 11:13:15.510"

Later, the date processor is interpreting 19 as 2019, but this is effectively error prone, and this will start failing at least in 2032. I tried changing the year in a date to 2032 and:

unexpected pipeline error: Text '2-04-03 11:13:15.076' could not be parsed at index 0

I will open an issue to fix this.

Thanks for reporting!

[jsoriano]

Oh, you already opened an issue, I will comment there.