Cluster and Vacuum Full

I have tables which are Master Detail and usually my program loads all detail
records of a master record. So I configured CLUSTER on all those detail
tables to use an index which is the relation with master table. With that I
can load less records to Shared Buffers because all detaild records are on
sequencial pages, that´s fine.

I know that to have this working I have to periodically run CLUSTER, ok too.

But today instead of CLUSTER I just ran VACUUM FULL. How vacuum full
recreates entirelly that table, like cluster does, I thought it would use
that index too, but didn´t. I didn´t see what sequence of records it did but
was not the one I´ve configured with cluster.

Is that expected or Vacuum should obbey cluster configuration ?

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