SERVER-124271 mergeSpills silently drops or duplicates elements when a write-conflict retry resets WiredTiger cursor positions

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• In Code Review

SERVER-124273 Unit tests for write conflicts during container based spilling

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• In Code Review

SERVER-122301 Handle write conflicts in container-based sorter spiller when merging spills

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• Closed

SERVER-118845 Handle the sorter -> index table writeConflictRetry when keyBatchSize > 1

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• Closed

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

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• Closed