jolshan commented on a change in pull request #9622:
URL: https://github.com/apache/kafka/pull/9622#discussion_r528407594



##########
File path: clients/src/main/resources/common/message/MetadataRequest.json
##########
@@ -31,9 +31,11 @@
     // Starting in version 8, authorized operations can be requested for 
cluster and topic resource.
     //
     // Version 9 is the first flexible version.
+    // Version 10 add topicId
     { "name": "Topics", "type": "[]MetadataRequestTopic", "versions": "0+", 
"nullableVersions": "1+",
       "about": "The topics to fetch metadata for.", "fields": [
-      { "name": "Name", "type": "string", "versions": "0+", "entityType": 
"topicName",
+      { "name": "TopicId", "type": "uuid", "versions": "10+", "ignorable": 
true, "about": "The topic id." },
+      { "name": "Name", "type": "string", "versions": "0+", "entityType": 
"topicName", "ignorable": true,

Review comment:
       As discussed in the mailing thread and the KIP writeup, this should be 
"nullable" rather than ignorable




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