Memory Leak after .close()

Hello, I tried to release used memory after .importOrLoad finished. This is my code, I used GraphHopper v1.

graphHopper.importOrLoad()
graphHopper.close()

My JVM is openjdk:8u292-slim-buster, running on Docker Container
But my RAM usage still high, even after 1 hour my GC can’t release it. What should I do ?

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