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Fixes #59,
Fixes #71,
Fixes #70 and attempts to partially fix #60 .
I have given some initial values for commit intervals but we should discuss the appropriate value of commit interval for each time window.
Regarding the move to confluent 4.1.0 and kafka 1.1.0, certain classes used by the app were deprecated and these should be updated. This can be tracked in #75
This should also give a better performance on MongoDB connector because of less duplicate records