diff --git a/test/external-modules/esql-heap-attack/src/javaRestTest/java/org/elasticsearch/xpack/esql/heap_attack/HeapAttackIT.java b/test/external-modules/esql-heap-attack/src/javaRestTest/java/org/elasticsearch/xpack/esql/heap_attack/HeapAttackIT.java
index 79e28d955c6f9..70f1ba529ec5e 100644
--- a/test/external-modules/esql-heap-attack/src/javaRestTest/java/org/elasticsearch/xpack/esql/heap_attack/HeapAttackIT.java
+++ b/test/external-modules/esql-heap-attack/src/javaRestTest/java/org/elasticsearch/xpack/esql/heap_attack/HeapAttackIT.java
@@ -684,6 +684,7 @@ private Map<String, Object> lookupExplosion(int sensorDataCount, int lookupEntri
             return responseAsMap(query(query.toString(), null));
         } finally {
             deleteIndex("sensor_data");
+            deleteIndex("sensor_lookup");
         }
     }