My guess is the date field in the Elasticsearch entry is 2020.10.09 00:00:00.000 UTC. Kibana uses the timezone of your browser to convert the UTC time to your local time. 2020.10.09 00:00:00.000 UTC is 20:00:00 in Easter Daylight time.
Pipelines can set the timezeone for a date field during ingestion. Check out the examples at https://www.elastic.co/guide/en/elasticsearch/reference/current/date-processor.html. When processed the UTC timestamp is offset based on the selected timezone.