Filebeat json input with tags not supported

[urso]

• Version: Any filebeat version supporting JSON input
• Steps to Reproduce:
  • json input with events having a tags field as array of string
  • add additional tags in filebeat configuration to the events
  • events from configuration file are not applied

Problem is the json parser converts the strings on input to []interface{}, but when adding any new tags, a type check testing for []string is in place only.

[uschtwill]

For reference: https://discuss.elastic.co/t/filebeat-tags-not-applied-if-json-event-already-has-a-tags-field/102974