Remove Kibana Date Picker for Index Patterns with no Time Field Filter

[NickBook]

Describe the feature:

First let me explain my situation:
I've got an index pattern with that doesn't use a time filter field. However, in my Kibana dashboard, there is still a a date picker next to the filter bar. Note that in my discover tab, there is no date picker for this index because the discover tab is limited to only one index pattern (hence it can remove the date picker).

In one dashboard, there can be multiple index patterns, so I can understand keeping the date picker there in case another index in the dashboard has a date filter. While having the date picker persist in the dashboard regardless of the index pattern is simpler to develop, it is confusing to an end user who can change the date picker and see nothing happen.

For those wondering why I do not to use a time filter: I have multiple time based fields (say start date time and end date time) and my end user may want to filter off of only start or only end time. Hence, I don't want to have one of these fields permanently fixed to an index pattern.

Feature Improvement Details:
I am suggesting that Kibana should remove/hide the date picker when all visuals in the dashboard come from index patterns with no time filter field.
Here's what I'm seeing in the dashboard

Here's what I'm seeing in discover. This is how I'd like to see the dashboard look for my end users.

Kibana discussion topic:
[https://discuss.elastic.co/t/kibana-dashboard-for-index-pattern-with-no-time-filter-field-still-has-date-picker/190290]

Cheers,
Nick

[elasticmachine]

Pinging @elastic/kibana-app

[geekpete]

As of 7.9.2, the Discover page seems to automatically hide the time picker for index patterns with no defined time field, but Dashboard view seems to always present the time picker.

vs

[ThomThomson]

Likely if we want to do this it'll be a matter of hiding the time picker when all data views used in the dashboard have no time field. I have given this impact:low, as I'm not sure that it's a common use-case

[bhavyarm]

We have had dashboards where panels came from both time series data and non time-series data. So there is definitely a case to be made for having time picker for them. And +1 to @ThomThomson 's suggestion for to hiding the time picker if all panels came from non-time series data.

[ThomThomson]

Note: If we do end up prioritizing this, we should ensure the time picker is only hidden when in view mode. It could be pretty jarring if an author was creating a new Dashboard and the time picker appeared and disappeared while they were working.

[ThomThomson]

Closing this because it has been added to our icebox. #154667