diff --git a/public/containers/ClearCacheModal/ClearCacheModal.tsx b/public/containers/ClearCacheModal/ClearCacheModal.tsx
index 0855da739..6597c0d52 100644
--- a/public/containers/ClearCacheModal/ClearCacheModal.tsx
+++ b/public/containers/ClearCacheModal/ClearCacheModal.tsx
@@ -113,7 +113,7 @@ export default function ClearCacheModal(props: ClearCacheModalProps) {
         const result = await services.commonService.apiCaller({
           endpoint: "indices.clearCache",
           data: {
-            index: unBlockedItems.join(","),
+            index: unBlockedItems.join(",") || "_all",
           },
         });
         if (result && result.ok) {
diff --git a/public/pages/Indices/containers/IndicesActions/IndicesActions.test.tsx b/public/pages/Indices/containers/IndicesActions/IndicesActions.test.tsx
index 2df5691b3..5af156c85 100644
--- a/public/pages/Indices/containers/IndicesActions/IndicesActions.test.tsx
+++ b/public/pages/Indices/containers/IndicesActions/IndicesActions.test.tsx
@@ -185,7 +185,7 @@ describe("<IndicesActions /> spec", () => {
       expect(browserServicesMock.commonService.apiCaller).toHaveBeenCalledWith({
         endpoint: "indices.clearCache",
         data: {
-          index: "",
+          index: "_all",
         },
       });
       expect(coreServicesMock.notifications.toasts.addSuccess).toHaveBeenCalledTimes(1);
@@ -238,7 +238,7 @@ describe("<IndicesActions /> spec", () => {
       expect(browserServicesMock.commonService.apiCaller).toHaveBeenCalledWith({
         endpoint: "indices.clearCache",
         data: {
-          index: "",
+          index: "_all",
         },
       });
       expect(coreServicesMock.notifications.toasts.addError).toHaveBeenCalledTimes(1);