diff --git a/x-pack/plugins/maps/public/classes/layers/new_vector_layer_wizard/create_new_index_pattern.ts b/x-pack/plugins/maps/public/classes/layers/new_vector_layer_wizard/create_new_index_pattern.ts
index f99b965458d906..d612c25157095f 100644
--- a/x-pack/plugins/maps/public/classes/layers/new_vector_layer_wizard/create_new_index_pattern.ts
+++ b/x-pack/plugins/maps/public/classes/layers/new_vector_layer_wizard/create_new_index_pattern.ts
@@ -12,7 +12,7 @@ export const createNewIndexAndPattern = async (indexName: string) => {
   return await getHttp().fetch<CreateDocSourceResp>({
     path: `/${INDEX_SOURCE_API_PATH}`,
     method: 'POST',
-    body: convertObjectToBlob({
+    body: JSON.stringify({
       index: indexName,
       // Initially set to static mappings
       mappings: {
@@ -25,7 +25,3 @@ export const createNewIndexAndPattern = async (indexName: string) => {
     }),
   });
 };
-
-const convertObjectToBlob = (obj: unknown) => {
-  return new Blob([JSON.stringify(obj)], { type: 'application/json' });
-};