Collection bulk write uses the naming scheme mongoc_bulk_operation* while client bulk write uses the naming scheme mongoc_bulkwrite*. This may be confusing to users as these naming schemes do not clearly delineate between the two types of bulk write APIs. Moreover, the C++ analogue of mongoc_bulk_operation_t is bulk_write while mongoc_bulkwrite_t is client_bulk_write, which defies expectations.

To avoid confusion, we should consider introducing typedefs like the following:

typedef mongoc_bulkwrite_t mongoc_client_bulkwrite_t
typedef mongoc_bulk_operation_t mongoc_collection_bulkwrite_t

Additionally, if possible, we could consider deprecating the old names to encourage the use of the new names.