Clean actions attribute of Bulk struct

[Gonzalo Molina Gallego]

I'm using (b *Bulk) Update(pairs ...interface{}) to modify a huge quantity of data in a collection. To avoid memory errors, I'm using batches to perform the bulk.Run().

The problem I've found is the bulk class does not clean the the array of actions actions []bulkAction. Should we add a method to clean this variable or in the Run() function set the array as empty?

Thanks in advance!