Different variants of the Time Machine User Guide share the following metadata keys:
VersionAudienceLanguage
For this particular document, Audience and Language are monovalued, i.e., only one value exists for each of these metadata keys. Version is multivalued, i.e., more than one value exists for this metadata key. It is possible to cluster results based on the Version metadata key.
Without clustering, variants of the Time Machine User Guide appear as separate results as follows:
When clustered by the Version metadata key, all versions of the Time Machine User Guide appear as a single search result as follows: