I can see why these tags appear similar and should be merged, but there are some dissimilarities in the context of a Webmaster:
index can be used when referring to a file (such as the default
index file of a web site or web server). There are a few questions
which have used this tag in that context. For example,
indexing could reference other topics, such as indexing a database,
but in the context of this site's focus (i.e., for Webmasters, not
Database Administrators), the tag's
Info seems to be fairly descriptive. It could however be even more
descriptive to create a tag called
search-engine-indexing as you
suggested, and make
indexing a synonym of that as John had
search-engine-indexing would apply to all search engines,
google-index is specific to just Google. Information that applies
to Google might not apply to the other search engines. For that
reason, it should probably have its own tag, while
search-engine-indexing could be used to reference this in general.
So to recap, we should create a tag for
search-engine-indexing and make
indexing a synonym of that, but leave
google-index as it is so users will know that the question is specific to only Google.
Thanks to Stephen's hard work, the
indexing tag was merged with a newly created
search-engine-indexing tag. All of the questions using the
index tag were either re-tagged with
search-engine-indexing or a newly created, more descriptive
directory-index tag. The
index tag should therefore automatically be removed from the site by the system in a day's time since it's no longer being used.
+1 to the community for making the site just a little bit better!