many services are enabled on Ali CVM. Check memory usage with top command and find

KiB Swap:        0 total,        0 free,        0 used

indicates that the swap partition is not open on the system.
the following process uses a large amount of virtual memory
for example, elastic uses 16 gigabytes of virtual memory.
Why is the process still using virtual memory when the swap partition is not open?
does the fact that virtual memory is used so much indicate that the system is out of memory?