Fix unit test
Added factorScore scorer to support boost_factor in
function_score_query:
http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/query-dsl-function-score-query.html#_boost_factor
Merge pull request #73 from fayvor/master

Added factorScore scorer to support boost_factor
Merge pull request #71 from stringbean/delete-dsl-test-fix

Fix DeleteIndexDslTest unit test