Spring Batch - Use bulk writes in MongoItemWriter

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Use bulk writes in MongoItemWriter

Up until now, the MongoItemWriter used MongoOperations.save() in a for loop to save items to the database. In this release, we replaced this mechanism with a single call to BulkOperations. With this change, the MongotItemWriter is 25x faster than the previous version, according to benchmark mongo-item-writer-benchmark.

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