Added boost query for namespace evaluation

Switched from Lucene query parser to ExtendedDisMax query parser. The ExtendedDisMax has a lot of new search functionality like boost queries and supports the full Lucene query parser syntax, so that non of our functionality will break.

From now on we can improve, for example, the evaluation of namespace, to provide individual scoring.

 * Improved logging in case of a bad request
 * Readded quotations to prevent query breaking
 * Removed whitespace

Change-Id: I9f7a8fd300d30372f3987af44e1904f238f3a978
Merge "Added boost query for namespace evaluation"