log.syslog.severity.name incorrect

[abraxxa]

Description of the issue:
The description of the field log.syslog.severity.name says: The Syslog numeric severity of the log event, if available.

The correct wording would be something like: The Syslog textual severity of the log event, if available.

Their exact strings should also be included to standardize them for easier filtering. Wikipedia lists keywords but I couldn't find them in RFC5424. Therefore I'm proposing to use the severity names as listed in RFC5424. If possible the field mapping should ignore the case, allowing to store them unmodified but still finding all possible case variants.

[ebeahan]

@abraxxa, thanks for this issue. I agree the log.syslog.severity.name field's description should describe capturing the text/keyword/label value and not the numeric value.

Their exact strings should also be included to standardize them for easier filtering.

Past conversation in #129 discussed this type of standardization in-depth in a new event.* field, but the conversation later stalled. If there's renewed interest, perhaps the conversation could continue there. However, I believe capturing the raw, unmodified value extracted from the source event in log.syslog.severity.name remains useful.

[abraxxa]

Thanks for the pointer to #129!

My intent was only to fix the docs and standardize the values in the log.syslog.severity.name field.
Normalizing them is a larger undertaking 😉