Ecto.Adapters.DynamoDB.Info.indexes

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

indexes(repo, tablename)

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Specs

indexes(Ecto.Repo.t(), table_name_t()) :: [
  {:primary | String.t(), [String.t()]}
]

Get a list of the available indexes on a table. The format of this list is described in normalise_dynamo_index!