I recently upgraded to the brand new ELK version 7.5, everything is working great except one annoying issue at the Discover's Pane:
I have an Index which contains 2 years worth of data, each document is timestamped (using the Date field), but documents before a specific date have missing/null values in one of the fields (which is not the Date field).
Whenever i set the Date's range to show data with documents that have null-value in the specific field, the Date histogram (at the top of the Discover's Pane) suddenly disappears.
In other words, the Date histogram is showing only when i filter the index to show only documents with existing value at the specific field.
I couldn't find any setting to solve this in the documentation.
Before the upgrade i was using ELK version 6.5 and i had no problem of this kind.
Also, if you wouldn't mind clicking the "Inspect" header button, selecting the "Request" tab, and then copying the query and posting it here, it'll help us diagnose further:
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