diff --git a/src/plugins/vis_type_timeline/public/__snapshots__/to_ast.test.ts.snap b/src/plugins/vis_type_timeline/public/__snapshots__/to_ast.test.ts.snap
index 2befab651964..a5440895a619 100644
--- a/src/plugins/vis_type_timeline/public/__snapshots__/to_ast.test.ts.snap
+++ b/src/plugins/vis_type_timeline/public/__snapshots__/to_ast.test.ts.snap
@@ -6,7 +6,7 @@ Object {
     Object {
       "arguments": Object {
         "expression": Array [
-          ".es(*)",
+          ".opensearch(*)",
         ],
         "interval": Array [
           "auto",
diff --git a/src/plugins/vis_type_timeline/public/timeline_vis_fn.ts b/src/plugins/vis_type_timeline/public/timeline_vis_fn.ts
index cd735bf2bc09..e56d6fd37af2 100644
--- a/src/plugins/vis_type_timeline/public/timeline_vis_fn.ts
+++ b/src/plugins/vis_type_timeline/public/timeline_vis_fn.ts
@@ -78,7 +78,7 @@ export const getTimelineVisualizationConfig = (
     expression: {
       types: ['string'],
       aliases: ['_'],
-      default: '".es(*)"',
+      default: '".opensearch(*)"',
       help: '',
     },
     interval: {
diff --git a/src/plugins/vis_type_timeline/public/timeline_vis_type.tsx b/src/plugins/vis_type_timeline/public/timeline_vis_type.tsx
index d3a076add8a5..7a5f515b7f5e 100644
--- a/src/plugins/vis_type_timeline/public/timeline_vis_type.tsx
+++ b/src/plugins/vis_type_timeline/public/timeline_vis_type.tsx
@@ -57,7 +57,7 @@ export function getTimelineVisDefinition(dependencies: TimelineVisDependencies)
     }),
     visConfig: {
       defaults: {
-        expression: '.es(*)',
+        expression: '.opensearch(*)',
         interval: 'auto',
       },
     },
diff --git a/src/plugins/vis_type_timeline/public/to_ast.test.ts b/src/plugins/vis_type_timeline/public/to_ast.test.ts
index c5d8dace30a9..a32a299f5ba7 100644
--- a/src/plugins/vis_type_timeline/public/to_ast.test.ts
+++ b/src/plugins/vis_type_timeline/public/to_ast.test.ts
@@ -38,7 +38,7 @@ describe('timeline vis toExpressionAst function', () => {
   beforeEach(() => {
     vis = {
       params: {
-        expression: '.es(*)',
+        expression: '.opensearch(*)',
         interval: 'auto',
       },
     } as any;