I ran into a weird issue. All of a sudden the time series visualization builder is not showing any data, just a white space. Discovery shows data and all other visualizations are working fine, its only the time series which can't seem to find any data. It looks like somehow time series can't connect/find the index.
I've tried rebooting the server and upgrading from 5.4.0 to 5.4.1 but no change. Is there any way to troubleshoot this issue? I haven't made any changes to ELK's configuration apart from change my index's timestamp to display YYYY/M/D, HH:mm instead of MMMM Do YYYY, HH:mm:ss.SSS but changing it back doesn't fix the problem and I don't see how that could be the root cause anyway.