For the MongoDB linkbench POC, we utilized the applyOps command to see how much we could emulate transactional semantics with the existing server features. As part of the transactions project, however, we will be using the doTxn command instead to run multi-statement transactions. We should modify the LinkStoreMongoDb class to use the doTxn command instead of the applyOps command. Until true transactional features are fully implemented at the server layer, and the API of doTxn diverges signficantly from applyOps, this task may just involve simple swapping out usages of the applyOps command with doTxn.