Prepare for OES2018 - swap has no UUID?

Preparing for upgrade of an OES2015SP1 server on VMware to OES2018.

Partitions are currently mounted by Device Path as was recommended for OES11 and OES2015.

Tried to change to mount by UUID, which is now preferred, and discovered that swap has no UUID.

I can find no recent information related to something like this.

Any suggestions on how to fix this, or is Device Path still OK?

Thanks.

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