I created an index and inserted documents on Elasticsearch 6.1.
I have a mapping for the "timestamp" field and it has a "date" type. Dates are showed using the correct date format in the "Discover" tab (I insert epoch timestamps and Kibana shows nice human dates).
When I create a dashboard and select a custom date range, Kibana always uses all my documents, it's not filtering anything. I tried using a time range that doesn't contain any document (like 100 years ago) and I always get the same results.
What could be the problem?