@spec add_index(manager_resource(), String.t(), reference()) :: :ok | {:error, term()}

@spec get_health(manager_resource()) :: {:ok, String.t()} | {:error, term()}

@spec get_reader(manager_resource(), String.t()) ::
  {:ok, reference()} | {:error, term()}

@spec get_stats(manager_resource()) :: {:ok, String.t()} | {:error, term()}

@spec new() :: {:ok, manager_resource()} | {:error, term()}

@spec reload_all(manager_resource()) :: :ok | {:error, term()}

@spec reload_reader(manager_resource(), String.t()) :: :ok | {:error, term()}

@spec reload_reader(manager_resource(), String.t(), boolean()) ::
  :ok | {:error, term()}

@spec remove_index(manager_resource(), String.t()) :: :ok | {:error, term()}

@spec set_policy(manager_resource(), String.t(), String.t()) :: :ok | {:error, term()}

@spec shutdown(manager_resource()) :: :ok | {:error, term()}