Ecto.Adapters.DynamoDB.Info.index_details

You're seeing just the function index_details, go back to Ecto.Adapters.DynamoDB.Info module for more information.
Link to this function

index_details(repo, tablename)

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Specs

index_details(Ecto.Repo.t(), table_name_t()) :: %{
  primary: [map()],
  secondary: [map()]
}

Get all the raw information on indexes for a given table, returning as a map.