Hi Voltaire,
It would be nicer if you could paste your config and lookup table, and some information which page you are reffering to.
Well, the information you are looking for is the following, there is a sample lookup table for http status, and how it needs to be configured.
Addfieldsfromexternaldatasources
But I guess you have already configured your lookup table.
Try to run the following inputlookup command to see if your lookup table is configured and accessible from Splunk.
| inputlookup YOUR_LOOKUP_TABLE_NAME
# inputlookup command doc
and see the field name you looked up exists and the lookup command you ran properly set.
for example, if input fieldname in your data and column name in lookup table are different, you need to associate the fieldname and colunmane using as in your lookup command like this:
... | lookup http_status status_code_in_lookup as status_code_fieldname OUTPUT status_description
See lookup command doc
Hope this helps
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