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MIT's license for the Google appliance limits us to 500,000 pages. In talking to Dave Conlon of IS&T, it appears we are well within that limit. As the IS&T web site work is generally not adding a lot of new pages, merely moving them from one location to another, I don't think at this point we will make an impact on the limits of the license.
Google search and keywords
MIT's Google does index meta tag content and this content is taken into account for searches, but by default there is no particular weight given to meta tag content in a search.
However, the meta tag fields can be specifically queried by adding arguments to the search command. See https://web-mit-edu.ezproxyberklee.flo.org/google/v4/mit/xml_reference.html#request_meta_filter
In short, we can search on keywords stored in meta tags as long as we construct the search query correctly.