I'm currently using version 7.8.0, I've indexed some documents into ES, but when I create a n Index Pattern in Kibana, it disappear automatically. Please see below some screenshots of this issue.
Creating a New Index pattern for filebeat-2020.12.09 index
Trying to see the filebeat* logs in Discover tab , but the index pattern is not available and keep asking me to create a new one
Could you please help me checking this issue?