Query DSL: Span Term Query wrongly parses when boost is provided, causing using it in span or to fail, closes elastic#1032.

Author: kimchy

modules/elasticsearch/src/main/java/org/elasticsearch/index/query/xcontent/SpanTermQueryParser.java

@@ -80,6 +80,7 @@ public class SpanTermQueryParser extends AbstractIndexComponent implements XCont
                     }
                 }
             }
+            parser.nextToken();
         } else {
             value = parser.text();
             // move to the next token