get_prefix memory useage is very high

Hi，anyone know？
When I just use etcd3 client to get_prefix for a big prefix(that has lots of keys), and do nothing with the return value and just return to the outter function, but the memory is still very hige, not decrease, only when shutdown the process the memory would decrease
Anyone know the reason?

Start at the etcd3 client's get_prefix entry point and reproduce the report with a large prefix whose returned value is discarded. Determine why memory remains high until process shutdown, then verify that memory is released after the operation or document the limitation with a focused regression test.

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