This change applies the Queryable Encryption protocol and on-disk format version 2 ("QEv2"), which is NOT backwards compatible with the preview version of QE ("QEv1"). Among the breaking changes include:

• New encrypted (on-disk and over-the-wire) payload formats that replace the QEv1 formats in preview.
• The server now responds with an error to encrypted CRUD commands that use any of the QEv1 payload formats.
• The server now responds with an error to delete, update, or findAndModify commands that include a deleteTokens field in their encryptionInformation field.
• Modifying or reading from an existing QEv1-encrypted collection using the QEv2 protocol may cause undefined behavior. Users must migrate their QEv1-encrypted data and drop the QEv1-encrypted collection (and its associated state collections) before upgrading the server to one that implements QEv2 (ie. 7.0 and above).
• The response returned by a compactStructuredEncryptionData command no longer includes the ecc field which contained read/write statistics for the ECC collection.

New options that were added include:

• a new cluster parameter called fleCompactionOptions which may contain two subfields:
  • maxCompactionSize - limits the total size of the set of ESC documents that will be removed by each compactStructuredEncryptionData operation. Defaults to 256 MiB.
  • maxESCEntriesPerCompactionDelete - limits the number of ESC non-anchor documents that will be removed by each delete operation performed by the compactStructuredEncryptionData operation. Defaults to 350k.

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