[MOD][bp/r53340] Make the query parser aware of explicit phrases and implicit phrases, make all engines ignore it, add phrase proximity re-scoring to elasticsearch to improve result relevance

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/13.x@53341 b456876b-0849-0410-b77d-98878d47e9d5