trying this

Author: original-brownbear

build-tools-internal/src/main/java/org/elasticsearch/gradle/internal/ElasticsearchTestBasePlugin.java

@@ -108,8 +108,8 @@ public void execute(Task t) {
             test.exclude("**/*$*.class");
 
             test.jvmArgs(
-                "-Xmx" + System.getProperty("tests.heap.size", "512m"),
-                "-Xms" + System.getProperty("tests.heap.size", "512m"),
+                "-Xmx" + System.getProperty("tests.heap.size", "256m"),
+                "-Xms" + System.getProperty("tests.heap.size", "256m"),
                 "-Dtests.testfeatures.enabled=true",
                 "--add-opens=java.base/java.util=ALL-UNNAMED",
                 // TODO: only open these for mockito when it is modularized

test/framework/src/main/java/org/elasticsearch/test/ESIntegTestCase.java

@@ -1909,13 +1909,13 @@ public void indexRandom(boolean forceRefresh, boolean dummyDocuments, boolean ma
                 Math.min(MAX_BULK_INDEX_REQUEST_SIZE, Math.max(1, (int) (builders.size() * randomDouble())))
             );
             logger.info("Index [{}] docs async: [{}] bulk: [{}] partitions [{}]", builders.size(), false, true, partition.size());
-            for (List<IndexRequestBuilder> segmented : partition) {
-                BulkResponse actionGet;
+            for (int i = 0; i < partition.size(); i++) {
+                List<IndexRequestBuilder> segmented = partition.set(i, null);
                 BulkRequestBuilder bulkBuilder = client().prepareBulk();
                 for (IndexRequestBuilder indexRequestBuilder : segmented) {
                     bulkBuilder.add(indexRequestBuilder);
                 }
-                actionGet = bulkBuilder.get();
+                BulkResponse actionGet = bulkBuilder.get();
                 assertThat(actionGet.hasFailures() ? actionGet.buildFailureMessage() : "", actionGet.hasFailures(), equalTo(false));
             }
         }