uploading zeek log files with rolled-over filenames including the date don't get the log type detected correctly

[mmguero]

A user reported that uploading zeek logs as described here:

the log type gets set as the name of the log.timestamp (eg: analyzer.03:00:00_03:49:27). Then there are some costume fields in the meta data that also have the same naming (eg: analyzer.03:00:00_03:49:27._path, analyzer.03:00:00_03:49:27.analyzer_kind), when going to a dashboard for a protocol a lot of the visualizations don't load any data because they don't know how to read some of the fields i guess. Just for some context the logs i'm playing with come from a hedgehog sensor capturing live data.

We need to verify that this is the case and figure out why this code isn't working to extract the field name correctly.