{
  "apiKey": 28,
  "type": "metadata",
  "name": "ClearElrRecord",
  "validVersions": "0",
  "flexibleVersions": "0+",
  "fields": [
   { "name": "TopicName", "type": "string", "versions": "0+",
     "entityType": "topicName", "about": "The name of the topic to clear ELRs for, or empty if all ELRs should be cleared." }
  ]
}