899139bc_for_Tracing_in_SQL_Server_2014__Description
[Package name] sqlserver [Event name] clustered_columnstore_index_rebuild [Description] 
Occurs when clustered index on the table was rebuilt. This event is raised three times for ALTER index rebuild operation on CCSI. The event is raised when the operation takes lock on index rebuild resource, when lock is taken on the table and when S lock on the table is upgraded to SCH_M lock to switch indexes in metadata.
New Extended Events for Tracing in SQL Server 2014
Description