You're seeing just the function secondary_indexes, go back to Ecto.Adapters.DynamoDB.Info module for more information.
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secondary_indexes(repo, tablename)

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secondary_indexes(Ecto.Repo.t(), table_name_t()) ::
  [{String.t(), [String.t()]}] | no_return()

returns a simple list of the secondary indexes (global and local) for the table. Uses same format for each member of the list as 'primary_key!'.