@type t() :: %Gleanex.Client.RecommendationsRequest{
  maxSnippetSize: integer() | nil,
  pageSize: integer() | nil,
  recommendationDocumentSpec: map() | nil,
  requestOptions: Gleanex.Client.RecommendationsRequestOptions.t() | nil,
  sessionInfo: Gleanex.Client.SessionInfo.t() | nil,
  sourceDocument: Gleanex.Client.Document.t() | nil,
  timestamp: DateTime.t() | nil,
  trackingToken: String.t() | nil
}