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 893acbd22cc23..4ed79024a19f9 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
@@ -884,8 +884,19 @@ private void initManyBigFieldsIndex(int docs, String type) throws IOException {
     }
 
     private void initGiantTextField(int docs) throws IOException {
-        logger.info("loading many documents with one big text field");
-        int docsPerBulk = 3;
+        int docsPerBulk = 10;
+        for (Map<?, ?> nodeInfo : getNodesInfo(adminClient()).values()) {
+            for (Object module : (List<?>) nodeInfo.get("modules")) {
+                Map<?, ?> moduleInfo = (Map<?, ?>) module;
+                final String moduleName = moduleInfo.get("name").toString();
+                if (moduleName.startsWith("serverless-")) {
+                    docsPerBulk = 3;
+                }
+            }
+        }
+
+        logger.info("loading many documents with one big text field - docs per bulk {}", docsPerBulk);
+
         int fieldSize = Math.toIntExact(ByteSizeValue.ofMb(5).getBytes());
 
         Request request = new Request("PUT", "/bigtext");
@@ -912,6 +923,7 @@ private void initGiantTextField(int docs) throws IOException {
             }
         }
         initIndex("bigtext", bulk.toString());
+        logger.info("loaded");
     }
 
     private void initMvLongsIndex(int docs, int fields, int fieldValues) throws IOException {