Close builder

Author: Tim-Brooks

server/src/main/java/org/elasticsearch/action/index/IndexRequest.java

@@ -425,8 +425,7 @@ public BytesReference source() {
     public void setStructuredSource(ESONSource.ESONObject esonSource) {
         this.useStructuredSource = true;
         this.structuredSource = esonSource;
-        try {
-            XContentBuilder builder = XContentFactory.contentBuilder(contentType);
+        try (XContentBuilder builder = XContentFactory.contentBuilder(contentType)) {
             ESONXContentSerializer.flattedToXContent(esonSource, builder, ToXContent.EMPTY_PARAMS);
             source = BytesReference.bytes(builder);
         } catch (IOException e) {