Unusual System.exit call in BulkProcessor

[ansell]

The main method in BulkProcessor contains a single path that calls System.exit instead of naturally completing. There is no reason to call System.exit(0) where it does, as there are no further instructions that would be run after that point and future maintainers may not realise this if they add any later code to the method:

https://github.com/AtlasOfLivingAustralia/biocache-store/blob/master/src/main/scala/au/org/ala/biocache/index/BulkProcessor.scala#L166