added missing cleanup statements for short memory cases during search

source/net/yacy/search/query/SearchEvent.java

@@ -606,6 +606,9 @@ public final class SearchEvent {
         if (this.IACount != null) this.IACount.clear();
         if (this.IAResults != null) this.IAResults.clear();
         if (this.heuristics != null) this.heuristics.clear();
+        this.rwiStack.clear();
+        this.nodeStack.clear();
+        this.resultList.clear();
     }
 
     public String abstractsString(final byte[] hash) {

source/net/yacy/search/query/SearchEventCache.java

@@ -116,6 +116,7 @@ public class SearchEventCache {
             final int burstRobinsonPercent,
             final int burstMultiwordPercent) {
 
+        if (MemoryControl.shortStatus()) cleanupEvents(true);
         final String id = query.id(false);
         SearchEvent event = getEvent(id);
         if (Switchboard.getSwitchboard() != null && !Switchboard.getSwitchboard().crawlQueues.noticeURL.isEmpty() && event != null && System.currentTimeMillis() - event.getEventTime() > 60000) {