Memory not released after job execution

Hello we have some jobs on IIB10 that use lots of RAM (Processing of large xml files witj java and ESQL nodes).
However once they are complete (sucessfully) RAM is not released to operating system (Windows Server).
DataFlowEngine.exe process stays at very high RAM usage and do not decrease.
Is it normal behaviour ? or are shall we do something in particular to release memory ?

Thanks.

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