The CoreDNS integration contains one dashboard ([Filebeat CoreDNS] Overview) with 4 visualizations. However, 2 out of 4 visualizations are showing below error in Kibana v8.0.0.
Could not find reference for kibanaSavedObjectMeta.searchSourceJSON.index
Below is the screenshot of the dashboard:

Steps to Reproduce
- Navigate to the CoreDNS integration page.
- Click on install assets.
- Click on the Assets tab.
- Open the dashboards.