Improve experience on dashboard when visualizations do not use index patterns created in Kibana

[bhavyarm]

Kibana version: 6.3.0 BC6

Browser version: chrome latest

Browser OS version: OS X

Original install method (e.g. download page, yum, from source, etc.): from staging

Describe the bug: If user has tsvb, markdown, input control, and vega vizs only on a dashboard( and they are not on default Kibana index pattern) and shares the iFrame - the add filter on them becomes useless(? - not sure if I am using the correct word here). Because its populated with fields from default index pattern in Kibana.

Steps to reproduce:

1. Create a dashboard with only TSVB, markdown, input control, and/or vega vizs
2. share the dashboard with an iFrame link (That step isn't even required)
3. Click on add filter - it has only fields from the default index pattern of Kibana

Expected behavior:
We need to either disable add filter or show a message to the user?

Screenshots (if relevant):

[bhavyarm]

cc @timroes / @stacey-gammon this is both bug and enhancement :)

[stacey-gammon]

Alright so I think this is more an issue with the experimental visualizations than with dashboard. They aren't giving dashboard the index patterns they use because they don't use index patterns created in Kibana.

Dashboard passes those index patterns to the filter bar.

Essentially any visualization that doesn't supply index patterns can't take advantage of the drop downs in the filter bar.

I tagged a bunch more groups since this is more of a problem of a global problem. I also don't have a good answer for how this should be handled.