diff --git a/public/app/plugins/datasource/elasticsearch/query_builder.js b/public/app/plugins/datasource/elasticsearch/query_builder.js
index 5f46c8892d4..129c52d3f02 100644
--- a/public/app/plugins/datasource/elasticsearch/query_builder.js
+++ b/public/app/plugins/datasource/elasticsearch/query_builder.js
@@ -127,7 +127,6 @@ function (angular) {
             "interval": this.getInterval(aggDef),
             "field": this.timeField,
             "min_doc_count": 0,
-            "format": "epoch_millis",
             "extended_bounds": { "min": "$timeFrom", "max": "$timeTo" }
           };
           break;