fix testQueryFacet in SimpleFacetsTests.scala

Fixed a test involving the use of `termsQuery`. The previous version passed in an `Array`, when the function actually expects a [variable number of arguments](https://github.com/elasticsearch/elasticsearch/blob/master/src/main/java/org/elasticsearch/index/query/QueryBuilders.java#L689). I used `:_*` to splat the array and use the elements as arguments.