diff --git a/public/app/plugins/datasource/elasticsearch/datasource.ts b/public/app/plugins/datasource/elasticsearch/datasource.ts
index b4984f93d87..90087940f66 100644
--- a/public/app/plugins/datasource/elasticsearch/datasource.ts
+++ b/public/app/plugins/datasource/elasticsearch/datasource.ts
@@ -835,7 +835,7 @@ export class ElasticDatasource
     if (obj === null || obj === undefined) {
       return true;
     }
-    if (['string', 'number', 'boolean'].some((type) => type === typeof true)) {
+    if (['string', 'number', 'boolean'].some((type) => type === typeof obj)) {
       return true;
     }