diff --git a/plugins/search-backend-module-elasticsearch/api-report.md b/plugins/search-backend-module-elasticsearch/api-report.md
index fb1b73a729..7de3a1857b 100644
--- a/plugins/search-backend-module-elasticsearch/api-report.md
+++ b/plugins/search-backend-module-elasticsearch/api-report.md
@@ -370,7 +370,7 @@ export type ElasticSearchSearchEngineIndexerOptions = {
   logger: Logger | LoggerService;
   elasticSearchClientWrapper: ElasticSearchClientWrapper;
   batchSize: number;
-  skipRefresh: boolean;
+  skipRefresh?: boolean;
 };
 
 // @public (undocumented)
diff --git a/plugins/search-backend-module-elasticsearch/src/engines/ElasticSearchSearchEngineIndexer.ts b/plugins/search-backend-module-elasticsearch/src/engines/ElasticSearchSearchEngineIndexer.ts
index 55782e1ead..55859ab9e6 100644
--- a/plugins/search-backend-module-elasticsearch/src/engines/ElasticSearchSearchEngineIndexer.ts
+++ b/plugins/search-backend-module-elasticsearch/src/engines/ElasticSearchSearchEngineIndexer.ts
@@ -33,7 +33,7 @@ export type ElasticSearchSearchEngineIndexerOptions = {
   logger: Logger | LoggerService;
   elasticSearchClientWrapper: ElasticSearchClientWrapper;
   batchSize: number;
-  skipRefresh: boolean;
+  skipRefresh?: boolean;
 };
 
 function duration(startTimestamp: [number, number]): string {