diff --git a/src/test/java/org/opensearch/knn/plugin/action/RestClearCacheHandlerIT.java b/src/test/java/org/opensearch/knn/plugin/action/RestClearCacheHandlerIT.java
index e7b454ebb..2618519f2 100644
--- a/src/test/java/org/opensearch/knn/plugin/action/RestClearCacheHandlerIT.java
+++ b/src/test/java/org/opensearch/knn/plugin/action/RestClearCacheHandlerIT.java
@@ -25,7 +25,6 @@
 public class RestClearCacheHandlerIT extends KNNRestTestCase {
     private static final String TEST_FIELD = "test-field";
     private static final int DIMENSIONS = 2;
-    private static final String ALL_INDICES = "_all";
 
     @SneakyThrows
     public void testNonExistentIndex() {
@@ -81,7 +80,7 @@ public void testClearCacheMultipleIndices() {
 
         assertEquals(graphCountBefore + 2, getTotalGraphsInCache());
 
-        clearCache(Arrays.asList(ALL_INDICES));
+        clearCache(Arrays.asList(testIndex1, testIndex2));
         assertEquals(graphCountBefore, getTotalGraphsInCache());
     }