This is the system-wide Swap files which gets created based on the system advanced swap file settings
-hls-* stands for hostlocal swap file.
In general you can end up with 3 different types of system-wide swap files based on the system advanced swap file settings and usage
Datastore -> sysSwap-ds-*
SSDDatastore -> sysSwap-hc-*
HostLocal' -> sysSwap-hls-*
Not sure about ESXi 6.0, but for 6.5 solution below worked very well.
Connect to https://your_esxi_host
Navigator > Host > Manage > System > Swap > Edit Settings >
Enable - Yes
Datastore - "chose your ssd"
Local swap - Enabled - Yes
Host Cache Enabled -Yes
Save and maybe reboot and try your patch installation again.