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WiredTigerOplogManager::_oplogJournalThreadLoop()

stop calling waitUntilDurable().
call setOplogTruncateAfterPoint to durably update the oplogTruncateAfterPoint to the WT all_committed timestamp.
remove the extra logic to wait for ops waiting for durability before proceeding – we will still have the logic to wait for a journal flush call before proceeding with the loop.

Note: this task is expected to improve performance.

depends on

SERVER-41389 Pause the oplog visibility thread in mode SECONDARY

SERVER-41391 Clear the oplogTruncateAfterPoint timestamp on stepdown

is related to

SERVER-41386 Create a JS test that ensures non-durable writes can replicate but are not counted for majority write concern

SERVER-41387 Create a test that ensures the oplogTruncateAfterPoint will correctly clear writes on startup after a primary restarts

related to

SERVER-44703 Complete TODO listed in SERVER-41392