Clear renderer hit groups

This allows us to stream more data than can fit in the container
(across all concurrent queries), as rendered hits in completed groups
can now be garbage collected.

We can not deference the hit groups themselves as that entails modifying
the parent list.

1 files changed, 6 insertions, 0 deletions

diff --git a/container-search/src/main/java/com/yahoo/search/result/Hit.java b/container-search/src/main/java/com/yahoo/search/result/Hit.java
index 076e6659d2b..0d8f575b1f6 100644
--- a/container-search/src/main/java/com/yahoo/search/result/Hit.java
+++ b/container-search/src/main/java/com/yahoo/search/result/Hit.java
@@ -797,4 +797,10 @@ public class Hit extends ListenableFreezableClass implements Data, Comparable<Hi
         }
     }
 
+    protected void close() {
+        query = null;
+        fields = null;
+        unmodifiableFieldMap = null;
+    }
+
 }