Update flat-object.md (#8863) (#8866)

_field-types/supported-field-types/flat-object.md

@@ -56,7 +56,8 @@ The flat object field type supports the following queries:
 - [Multi-match]({{site.url}}{{site.baseurl}}/query-dsl/full-text/multi-match/) 
 - [Query string]({{site.url}}{{site.baseurl}}/query-dsl/full-text/query-string/) 
 - [Simple query string]({{site.url}}{{site.baseurl}}/query-dsl/full-text/simple-query-string/) 
-- [Exists]({{site.url}}{{site.baseurl}}/query-dsl/term/exists/) 
+- [Exists]({{site.url}}{{site.baseurl}}/query-dsl/term/exists/)
+- [Wildcard]({{site.url}}{{site.baseurl}}/query-dsl/term/wildcard/)
 
 ## Limitations
 
@@ -243,4 +244,4 @@ PUT /test-index/
 ```
 {% include copy-curl.html %}
 
-Because `issue.number` is not part of the flat object, you can use it to aggregate and sort documents.
+Because `issue.number` is not part of the flat object, you can use it to aggregate and sort documents.