We are using the Elastic Cloud hosted solution on AWS at version 6.6.1. We are using filebeats 6.6.0 and the IIS module to parse IIS 10 logs into Elastic Search.
When we look at the logs page we are seeing many
failed to format message from c:\inetpub\logs\Logfiles\W3SVC3\u_ex190220.log
lines. This error appears at https://github.com/elastic/kibana/blob/master/x-pack/plugins/infra/server/lib/domains/log_entries_domain/builtin_rules/index.ts in the source code. My typescript isn't good enough for me to trace the problem.
Does anybody know if we are doing anything wrong or is there a bug in Kibana?