In v2 of the QE protocol, the compactStructuredEncryptionData command changed behavior and so the following changes must be made:

• the code to compact the ECC can be removed
• compaction of the ESC entries for each unique field+value+contention combination now occurs in its own transaction.
• a subset, P,  of non-anchor ESC document _ids must be read into memory, before starting any ESC compaction transaction.
• once all ESC compactions are finished, for each _id in P, delete the document with that _id in ESC.