Dashboard filtering isn't loading fields

[shaharmor]

Kibana version: 6.x

Steps to reproduce:

1. Create a dashboard with only visualizations that don't have an index pattern (TSVB / Timelion)
2. Try to add a filter using the "Add a filter" button in the Filter Bar. (You have to enable it by adding at least 1 filter in the discover)
3. See that no fields are loaded to the select box

[shaharmor]

It has something to do with indexPatterns not being set up correctly.
Also, this line is only checking for the old vis indexPattern style: https://github.com/elastic/kibana/blob/6.x/src/core_plugins/kibana/public/visualize/embeddable/visualize_embeddable_handler.js#L48

[shaharmor]

@simianhacker any chance you take a look at this?
This is actually a bug not only in TSVB, and I'm not sure what Kibana's approach to filtering in dashboards.

Would really like to have that feature :)

[simianhacker]

This is happening because TSVB and Timelion are missing the SearchSource to extract the index pattern from. It should probably fall back to the "default index pattern" for Kibana.

[Bargs]

We also just discovered that this causes the filter bar to disappear on dashboards that only have TSVB/Timelion visualizations. The filter bar is only displayed if filters already exist or if a panel has registered its index pattern with the dashboard scope. Tested in 5.6 and 7.0.

[nreese]

closed by #16235