Revert "Mute DefaultShardsIT#testDefaultShards test"

This reverts commit 2dd7e3f.

Author: ywelsch

distribution/archives/integ-test-zip/src/test/java/org/elasticsearch/test/rest/DefaultShardsIT.java

@@ -31,7 +31,6 @@
 
 public class DefaultShardsIT extends ESRestTestCase {
 
-    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/31408")
     public void testDefaultShards() throws IOException {
         final Response response = client().performRequest(new Request("PUT", "/index"));
         final String warning = response.getHeader("Warning");