Thanks for the bug report.
The information you have provided shows gnome-shell using only 190 MB
RES (resident in memory):
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
4802 yazid 20 0 5857452 190408 63240 S 31.9 1.2 0:45.75 gnome-s+
Ignore the VIRT values because that's just virtual address space.
It appears your main problem is actually java using 8G of RES:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1754 elastic+ 20 0 16.1g 8.1g 15664 S 1.0 53.5 1:12.76 java
** Changed in: gnome-shell (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1982813
Title:
My 16G of ram is fully consumed, GNOME is accused for that
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