2- Investigate to increase the batch size of the storage transaction.

• Set fetcher batch size - setBatchSize (first batch), setLimit (2nd batch and beyond)
• See if we still need to further batch the results of the fetcher so that we don't try to do too many collection/index inserts within one WUOW. - we should check that the size of a WUOW batch is < 16MB so that it doesn't go beyond the oplog entry size