Unexpected type mapstr.M warning

[Alex_Lavrov]

Hello,

I'm sending JSON logs using filebeat and suddenly I started to get this error:

{"log.level":"warn","@timestamp":"2022-12-08T23:33:51.575+0200","log.logger":"conditions","log.origin":{"file.name":"conditions/matcher.go","file.line":96},"message":"unexpected type mapstr.M in contains condition as it accepts only strings.","service.name":"filebeat","ecs.version":"1.6.0"}

Can't understand what exactly causing it. I checked all log entries, all of them are valid JSON's ...

Thank you in advance.

[Venkata_Raja]

Hi Alex,

Welcome to Community!
It seems your contains condition is throwing an error as it is expecting strings only. Check your filebeat processors configuration?
More details here: Define processors | Filebeat Reference [8.5] | Elastic

[Alex_Lavrov]

Hello,

Thank you for the welcome

The only processors section that I have is the default one:

processors:
  - add_host_metadata:
      when.not.contains.tags: forwarded
  - add_cloud_metadata: ~
  - add_docker_metadata: ~
  - add_kubernetes_metadata: ~

[Venkata_Raja]

If you are not using that contains condition , you can remove it