It seems that the vast majority of the questions tagged apache are relevant to some variant of Apache 2. There are 34 questions that are apache but the body of which contains a reference to apache 1.3 or apache1.3, these would need to be checked and manually retagged apache1 if required as at least some are just referring back to some feature of Apache 1.3.
Once the above is done then
Retag apache and apache2.2 to apache2
Retag apache1.3 to apache1
Blackhole/block the use of apache