ExAws.SQS.send_message_batch

You're seeing just the function send_message_batch, go back to ExAws.SQS module for more information.
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send_message_batch(queue_url, messages)

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Specs

send_message_batch(
  queue_url :: binary(),
  messages :: [sqs_batch_message(), ...]
) :: ExAws.Operation.Query.t()

Send up to 10 messages to a SQS Queue in a single request.

AWS API Docs