Index pattern management screen is stale (non-updating) after refreshing

[legrego]

Kibana version: 7.6.1

Describe the bug:
It seems that the index pattern management UI gets into a stale state after refreshing an index pattern. The grid does not automatically update with the new details of the refreshed index pattern, until the user interacts with the screen in such a way that the screen is forced to redraw.

Steps to reproduce:

• Create a test index with a field in it

POST test-index-1/_doc
{
  "field1": "test"
}

• Go to Kibana -> Management -> Index patterns
• Using a dedicated browser tab, create an index pattern matching test-index-1 then hit Create and you'll see the one field in there, leave this page open without refreshing
• Using a new/separate tab, switch back to dev console and add a new field to the index via

POST test-index-1/_doc
{
  "field2": "test"
}

• then switch back to the Index Pattern tab and hit the Refresh Field List button at the top right
• a modal popup is created, hit Refresh but keep your mouse away from the Refresh Field List button
• at this point nothing will happen to the field count until you mouse over the Refresh Field List button again.
• mouse over the Refresh Field List button again in the top right without clicking an as soon as you overlap it with the mouse cursor, the field list will refresh

[elasticmachine]

Pinging @elastic/kibana-app (Team:KibanaApp)

[elasticmachine]

Pinging @elastic/kibana-app-arch (Team:AppArch)

[mattkime]

Closing as the field cache was removed in 7.11 - #82223 Feel free to reopen if there's something I've missed.