Issue #1444912 by jordojuice: Add options for limiting which content fields are added to the MATCH query.

Issue #1444870 by jordojuice: Use multiple fields in MATCH instead of using the OR operator when including additional fields.

Issue #1270404: Add parameter to nid argument handler's query() method to ensure it complies with its parent's abstract query() method signature.

Issue #73084: Fields support.