feat(search-backend-module-es): test error handling

Co-authored-by: Emma Indal <emma.indahl@gmail.com>
Signed-off-by: Camila Belo <camilaibs@gmail.com>

plugins/search-backend-module-elasticsearch/src/engines/ElasticSearchSearchEngine.test.ts

@@ -793,6 +793,29 @@ describe('ElasticSearchSearchEngine', () => {
 
       elasticSearchQuerySpy.mockClear();
     });
+
+    it('should throws missing index error', async () => {
+      jest.spyOn(clientWrapper, 'search').mockRejectedValue({
+        meta: {
+          body: {
+            error: {
+              type: 'index_not_found_exception',
+            },
+          },
+        },
+      });
+
+      await expect(
+        async () =>
+          await testSearchEngine.query({
+            term: 'testTerm',
+            types: ['unknown'],
+            filters: {},
+          }),
+      ).rejects.toThrow(
+        'Missing index for unknown__search. This means there are no documents to search through',
+      );
+    });
   });
 
   describe('indexer', () => {