revert javadoc too

Author: rjernst

server/src/main/java/org/elasticsearch/search/query/SearchTimeoutException.java

@@ -18,7 +18,7 @@
 
 /**
  * Specific instance of {@link SearchException} that indicates that a search timeout occurred.
- * Always returns http status 429.
+ * Always returns http status 504 (Gateway Timeout)
  */
 public class SearchTimeoutException extends SearchException {
     public SearchTimeoutException(SearchShardTarget shardTarget, String msg) {