For the sharded variant of v2 compactStructuredEncryptionData, the set of ESC entries that need to be deleted will have to be persisted to a temp collection, so that the compaction may resume following a step down or a node failure. This snapshot of ESC must be taken prior to the renaming of the ECOC to enxcol_.<collName>.ecoc.compact.

During the "drop" phase, this temporary ESC collection must also be deleted along with the temp ECOC collection.