Revisit removal of Creators and Contributor metadata from search index

[mura]

Since we now display creator metadata entered in the field on the metadata page (as opposed to the user that plone considers to be the contributor), but we don't include creators in search, we can have situations where the creator last name appears on the page in the citation, but a user can't actually search for that name.

[dray]

I have concluded that this field, in default Plone, really is deceptive and poorly implemented. Based on those facts, we will not expose the field again, as it doesn't search for what we would like it to be searching for.

While Plone provides a Creators field, there is a subset of that field called Creator, which is the first entry in the Creators Field. Plone provides *no* mechanism for searching values NOT in the 1st element, as well as not searching the Contributors field.

In essence, without a total rewrite of Plone's querying engine, we will not be able to retrieve the data that is presented in the citation/metadata fields via search. Unfortunately, that is outside of the scope of what this bug initially requested.

Leaving the bug open, to revisit at a later date.