I'm having the same issue as described in the topic linked below. I cannot access any of the data in the user_messages or raw-logs (which I assume is supposed to be used in the place of the apachelogs* index in the instructions?) indices when I create a pattern and use a timestamp. It says the fields are there, but no data. I have made sure to change the time filter at the top too.
When I create a pattern using these indices and specify not to use a timestamp, the data is all there and accessible in dashboards and discover.
Thanks for any help you can provide.