Major Description
Currently AsyncIndexUpdate creates a checkpoint with a lifetime of 3
years. Post index complete the checkpoint is moved to point to revision upto which indexing is done and previous checkpoint is released.
Now if a system is killed when a index update is in progress particularly in run method where a new checkpoint gets created (Line 229) then that checkpoint would not be released and also would not be recorded in index metadata. Such a checkpoint would prevent GC for a long time.