While Kibana uses the timezone detected by the browser as default, Elasticsearch stores the timestamp of a document in UTC.
In addition, Kibana shows the timestamp as
MMMM Do YYYY, HH:mm:ss.SSS; it does not contain the timezone information.
This is very confusing when handling UTC timestamps in other timezones, e.g., JST.
To ensure Kibana shows timestamps in UTC, the following Advanced Settings are required:
dateFormat:tz = UTC
dateFormat = MMMM Do YYYY, HH:mm:ss.SSS, z