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No, the traffic won't be recorded by VPC flow logs. Traffic between IP addresses belonging to the same operating system environment (like your Linux or Windows server) never leaves the internal networking software stack of the operating system. No external network component or packet capturing tool in the cloud or on premises can see it.
Hi Leo, thanks a lot for your answer. Is there any problem or is it possible for services running on the same instance to communicate using just the same private IP of that instance?
@AKMin You can connect freely between any IP addresses configured on the same operating system instance. If you have immense numbers of connections opened and closed within a very short timeframe, it's possible that the maximum number of TCP port numbers would be exceeded, in which case you might need either multiple IP addresses or to configure the O/S to use a larger ephemeral port range for TCP. Unless you're expecting huge numbers of connections, one IP will suffice just fine.
Thanks for your answers. They are very helpful.