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{ "name": "ErrorMessage", "type": "string", "versions": "3+", "nullableVersions": "3+", "ignorable": true, "default": "null",  
  "about": "The error message, or null if there was no error." }  

A new generic error code is added to the per-group ErrorCode slot:

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• Optional<StreamsGroupTopologyDescription> topologyDescription() — empty unless the field was requested and the plugin returned a description.

• StreamsGroupTopologyDescriptionStatus topologyDescriptionStatus() — a new enum {

  AVAILABLE,

  NOT_REQUESTED, NOT_STORED, ERROR, AVAILABLE }. Each enum value's ordinal matches the wire-level TopologyDescriptionStatus int8 (0, 1, 2, 3). AVAILABLE is reported when TopologyDescription is non-null

  ; the remaining values mirror the wire-level TopologyDescriptionStatus int8

  .

The Admin client exposes a POJO hierarchy in org.apache.kafka.clients.admin that mirrors org.apache.kafka.streams.TopologyDescription but lives in the clients module. The admin client converts the wire-format struct into this hierarchy.

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