memcached_flush_buffers() is used in conjunction with
MEMCACHED_BEHAVIOR_BUFFER_REQUESTS (see memcached_behavior(3)) to flush
all buffers by sending the buffered commands to the server for processing.
RETURN
A value of type "memcached_return_t" is returned
On success that value will be "MEMCACHED_SUCCESS".
Use memcached_strerror() to translate this value to a printable string.