KIP-516: CreateTopics and DeleteTopics bump (breaking protocol changes)

Breaking:
- a string is converted to a nullable string in DeleteTopicsResponse
- Topics is changed to TopicNames in DeleteTopicsRequest, so that Topics
  itself can be used for a new struct that contains both the name and ID

generate/definitions/19_create_topics

@@ -4,7 +4,7 @@
 // creation defaults. See KIP-464.
 //
 // Version 5, also in 2.4.0, returns topic configs in the response (KIP-525).
-CreateTopicsRequest => key 19, max version 6, flexible v5+, admin
+CreateTopicsRequest => key 19, max version 7, flexible v5+, admin
   // Topics is an array of topics to attempt to create.
   Topics: [=>]
     // Topic is a topic to create.
@@ -45,6 +45,8 @@ CreateTopicsResponse =>
   Topics: [=>]
     // Topic is the topic this response corresponds to.
     Topic: string
+    // The unique topic ID.
+    TopicID: uuid // v7+
     // ErrorCode is the error code for an individual topic creation.
     //
     // NOT_CONTROLLER is returned if the request was not issued to a Kafka

generate/definitions/20_delete_topics

@@ -1,7 +1,11 @@
 // DeleteTopicsRequest deletes Kafka topics.
-DeleteTopicsRequest => key 20, max version 5, flexible v4+, admin
+DeleteTopicsRequest => key 20, max version 6, flexible v4+, admin
   // Topics is an array of topics to delete.
-  Topics: [string]
+  TopicNames: [string] // v0-v5
+  // The name or topic ID of topics to delete.
+  Topics: [=>] // v6+
+    Topic: nullable-string
+    TopicID: uuid
   // TimeoutMillis is the millisecond timeout of this request.
   TimeoutMillis: int32
 
@@ -13,7 +17,9 @@ DeleteTopicsResponse =>
   // Topics contains responses for each topic requested for deletion.
   Topics: [=>]
     // Topic is the topic requested for deletion.
-    Topic: string
+    Topic: nullable-string-v6+
+    // The topic ID requested for deletion.
+    TopicID: uuid // v6+
     // ErrorCode is the error code returned for an individual topic in
     // deletion request.
     //
@@ -30,6 +36,12 @@ DeleteTopicsResponse =>
     // and brokers >= 2.1.0. INVALID_REQUEST is issued for request versions
     // 0-2 against brokers >= 2.1.0. Otherwise, the request hangs until it
     // times out.
+    //
+    // UNSUPPORTED_VERSION is returned when using topic IDs with a cluster
+    // that is not yet Kafka v2.8+.
+    //
+    // UNKNOWN_TOPIC_ID is returned when using topic IDs to a Kafka cluster
+    // v2.8+ and the topic ID is not found.
     ErrorCode: int16
     // ErrorMessage is a message for an error.
     ErrorMessage: nullable-string // v5+

pkg/kversion/kversion.go

@@ -683,5 +683,9 @@ var maxTip = nextMax(max270, func(v []int16) []int16 {
 	// KAFKA-12212 7a1d1d9a69a241efd68e572badee999229b3942f KIP-700
 	v[4]++ // 11 metadata
 
+	// KAFKA-10764 4f588f7ca2a1c5e8dd845863da81425ac69bac92 KIP-516
+	v[19]++ // 7 create topics
+	v[20]++ // 6 delete topics
+
 	return v
 })