I have a lot of apache logs and I would like to make a pie about terms of a field that may contain any string, and often contains "-".
According to this comment, the "-" is seen as null by Elasticsearch. When I do the pie with terms, I only have the other strings, (there is only two other values possible) and no "-", while most of the pie should be about "-" logs.
How can I do a pie that includes the "-" values?
I'm using Elasticsearch/Kibana 6.0.0.