Is Terms included in the remaining heap after the GC?

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Hello.

I would like to ask question about the heap memory.
I am trying to free up heap memory by closing old indices.

When I look at the chart of heap usage there is always some left overs after each old gc . In below example about 8.0 gb is remained after each gc.

gc
gc.PNG840×226 42 KB

By looking at Terms in Index memory chart , there seems to be no change in the trend event though gc occurs. So I thought Terms remains after each gc therefore I thought I could free more heap memory by closing the index which means I am freeing Terms area of each index.

index_memory
index_memory.PNG833×222 37.7 KB

Is Terms one of the area which remains after the GC ?

I appreciate if I could get some help with my question.

Best Regards,
Yu Watanabe

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