Query::Compound - Conditionally quote search keyword

[bwoodmansee]

If the search term is provided in a hash, but the keyword itself is actually not complex the quoting will yield incorrect results

For example, in order to match all documents it is necessary to use a matchall search query and apply the q.parser=structured query param. It would be nice to do this as a Compound query, to take advantage of the q.parser param being appended, however, with the way things are currently quoted, it's not possible.

With this fix, you can do search.search({q: 'matchall'}) to perform a search that matches all documents