Java api: make BoostableQueryBuilder package private

core/src/main/java/org/elasticsearch/index/query/BoostableQueryBuilder.java

@@ -22,12 +22,12 @@ package org.elasticsearch.index.query;
 /**
  * Query builder which allow setting some boost
  */
-public interface BoostableQueryBuilder<B extends BoostableQueryBuilder<B>> {
+interface BoostableQueryBuilder<B extends BoostableQueryBuilder<B>> {
 
     /**
      * Sets the boost for this query.  Documents matching this query will (in addition to the normal
      * weightings) have their score multiplied by the boost provided.
      */
-    public B boost(float boost);
+    B boost(float boost);
 
 }