[Discover] Loading Discover with removed index gives two equal error toasts instead of one

[dimaanj]

Kibana version:
main
Elasticsearch version:

Server OS version:

Browser version:

Browser OS version:

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

Describe the bug:
Loading Discover with removed index gives two equal error toasts instead of one.
Steps to reproduce:

1. Create data view with index
2. Open Discover and save the link to a current view
3. Remove index
4. Open Discover using saved link
5. See two equal error toasts instead of one (No matching indices found: ...)

Expected behavior:
Only one error toast should be displayed

[elasticmachine]

Pinging @elastic/kibana-data-discovery (Team:DataDiscovery)

[kertal]

I think it's because 2 queries are responding (documents + histogram) with errors. I think it improved but I don't think it's a Discover task to do so, there's a related issue here: #67270

[kertal]

So I think this can be closed as it would be resolved once there's a solution for repeated error messages

[kertal]

Closing since @dimaanj agreed by 👍