SOLR-4729: LukeRequestHandler: Using a dynamic copyField source that is not also a dynamic field triggers error message 'undefined field: "(glob)"' (merged trunk r1470820)

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1470821 13f79535-47bb-0310-9956-ffa450edef68