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{
  "apiKey": TBD,
  "type": "request",
  "listeners": ["broker"],
  "name": "StreamsGroupInitializeRequest",
  "validVersions": "0",
  "flexibleVersions": "0+",
  "fields": [
    { "name": "GroupId", "type": "string", "versions": "0+", "entityType": "groupId",
      "about": "The group identifier." },
    { "name": "TopologyId", "type": "string", "versions": "0+",
      "about": "The ID of the topology." },
    { "name":  "Topology", "type": "[]Subtopology", "versions": "0+",
      "about": "The sub-topologies of the streams application.",
      "fields": [
        { "name": "SubtopologySubtopologyId", "type": "string", "versions": "0+",
          "about": "String to uniquely identify the sub-topology. Deterministically generated from the topology" },
        { "name": "SourceTopics", "type": "[]string", "versions": "0+",
          "about": "The topics the topology reads from." },
        { "name": "SourceTopicRegex", "type": "string", "versions": "0+", "nullableVersions": "0+", "default": "null",
           "about": "The regular expressions identifying topics the sub-topology reads from. null if not provided." },
        { "name": "StateChangelogTopics", "type": "[]TopicInfo", "versions": "0+",
          "about": "The set of state changelog topics associated with this sub-topology. Created automatically." },
        { "name": "RepartitionSinkTopics", "type": "[]string", "versions": "0+",
          "about": "The repartition topics the sub-topology writes to." }, 
        { "name": "RepartitionSourceTopics", "type": "[]TopicInfo", "versions": "0+",
          "about": "The set of source topics that are internally created repartition topics. Created automatically." }
      ]
    }
  ],
  "commonStructs": [
    { "name": "TopicConfig", "versions": "0+", "fields": [
        { "name": "key", "type": "string", "versions": "0+",
          "about": "The key of the topic-level configuration." },
        { "name": "value", "type": "string", "versions": "0+",
          "about": "The value of the topic-level configuration," }
      ]
    },
    { "name": "TopicInfo", "versions": "0+", "fields": [
      { "name": "Name", "type": "string", "versions": "0+",
        "about": "The name of the topic." },
      { "name": "Partitions", "type": "int32", "versions": "0+",
        "about": "The number of partitions in the topic. Can be 0 if no specific number of partitions is enforced. Always 0 for changelog topics." },
      { "name": "TopicConfigs", "type": "[]TopicConfig", "versions": "0+", "nullableVersions": "0+", "default": "null",
        "about": "Topic-level configurations as key-value pairs."
      }
    ]}
  ]
}