Is this recycle of soft reference?

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DevCap_20180914_142644
DevCap_20180914_142644.png1903×788 187 KB

In this picture, there is a steep drop in JVM Heap graph between 8 a.m. to 9 a.m.. I am wondering the reason of this.

My log entered smoothly at that time (8 a.m to 9 a.m).

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1.png1397×187 29.5 KB

What is that? Is recycle of soft reference in Java?
This is important cause I am investigating how much heap size is suitable for my service.

Version of Elastic stack is 6.3.1, and my server os is
Linux 581dd302fe61 3.10.0-327.el7.x86_64 #1 SMP Thu Nov 19 22:10:57 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

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