// DeleteTopicsRequest deletes Kafka topics.
DeleteTopicsRequest => key 20, max version 6, flexible v4+, admin
  // Topics is an array of topics to delete.
  TopicNames: [string] // v0-v5
  // The name or topic ID of topics to delete.
  Topics: [=>] // v6+
    Topic: nullable-string
    TopicID: uuid
  TimeoutMillis

// DeleteTopicsResponse is returned from a DeleteTopicsRequest.
// Version 3 added the TOPIC_DELETION_DISABLED error proposed in KIP-322
// and introduced in Kafka 2.1.0. Prior, the request timed out.
DeleteTopicsResponse =>
  ThrottleMillis(2) // v1+
  // Topics contains responses for each topic requested for deletion.
  Topics: [=>]
    // Topic is the topic requested for deletion.
    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.
    //
    // TOPIC_AUTHORIZATION_FAILED is returned if the client is not authorized
    // to delete a topic.
    //
    // UNKNOWN_TOPIC_OR_PARTITION is returned if the broker does not know of
    // the topic.
    //
    // NOT_CONTROLLER is returned if the request was not issued to a Kafka
    // controller.
    //
    // TOPIC_DELETION_DISABLED is returned for deletion requests version 3+
    // 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+