The goal of this ticket is to fix the known issues with read/write operations running concurrently with shard key value updates.

As of today (Apr 11 2025), here is the list of known issues:

• SERVER-54127: Retryable update by _id may execute more than once if intervening write changes document's owning shard
• SERVER-103727: Improve the semantics of read operations using coll scan or _id index scan in the presence of concurrent shard key value updates
• SERVER-103728: Improve the semantics of write operations using coll scan or _id index scan in the presence of concurrent shard key value updates