SERVER-121883 Have a maximum batch size in bytes when loading from the sorter into the index

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• Closed

SERVER-118892 Handle write conflicts in container-based sorter spiller when spilling

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• Closed

SERVER-118769 Add jstests with write conflicts to primary-driven index build suites

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• Closed

SERVER-120200 Return status from _addKeyForCommit to handle failed container writes when adding index keys to container

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• Closed