I am very exited about the new federated search feature starting the Splunk 8.2 version! I got it to run with a onPrem development machine and a regular index - works as desired and described.
However, if I try the same procedure with a metrics index as a remote data set, my search either index=federated:my_metrix_index or |mpreview index=federated:my_metrix_index do not return any result and there is no error returned.
Is this currently the intended behaviour? I would assume, that the REST endpoint is not yet completely adjusted.