Metrics selection in Splunk app for infrastructure (analysis tab) not working after moving index to S3

[brunofernandez]

I am using the Splunk App for infrastructure to collect metrics.
One of my index is called prometheus_dock.
Using SmartStore I recently moved the buckets for that index to S3.
Everything is working fine. I can still query the metrics in search panel (mstats) for that particular index.
However, since the move, when I am trying to explore metrics for entities (tab Analysis, Metrics on the left hand side of the screen) I cannot select metrics as I am getting this error message:

Failed to localize fileTypeSet="{"file_types":["tsidx","deletes"]}" for bid=prometheus_dock~44~91006D1B-62E3-4512-8E14-7120EE9BA8B4

Splunkd.log does not say much either:

MetricStoreCatalogBaseHandler - Failed to localize fileTypeSet="{"file_types":["tsidx","deletes"]}" for bid=prometheus_dock~44~91006D1B-62E3-4512-8E14-7120EE9BA8B4

My guess is that (as oppose as Splunk core), the Splunk app for infrastructure can only get data from local storage and cannot connect to S3...

[ntankersley_spl]

The App for Infra team has been unable to reproduce this issue. Did the index name for the metrics change?