redactChannelMessage  
  inline suspend fun ChimeSdkMessagingClient.redactChannelMessage(crossinline block: RedactChannelMessageRequest.Builder.() -> Unit): RedactChannelMessageResponse
Redacts message content and metadata. The message exists in the back end, but the action returns null content, and the state shows as redacted.
The x-amz-chime-bearer request header is mandatory. Use the ARN of the AppInstanceUser or AppInstanceBot that makes the API call as the value in the header.