No error is reported.
A Dtrace of EVIndexVolumesProcessor process while performing the Index Volume Rebuild reveals the following:
{WriteReportHeaderState} The only index volume for this content source is empty
{EVRebuildSubTask} Setting RebuildEndSequenceNumber to [0]
{EVRebuildSubTask} Setting CurrentRebuildUpgradeStepID to [Switching_Completed]
The above line RebuildEndSequenceNumber equals 0, indicates a Null value in the Enterprise Vault Directory - Index Volume - HighestItemSequenceNumber field.
If you are affected by the aforementioned issue, please get in touch with Enterprise Vault Support for further assistance.
