code: function CreateDocumentRequest(properties) {
                      if (properties)
                          for (var keys = Object.keys(properties), i = 0; i < keys.length; ++i)
                              if (properties[keys[i]] != null)
                                  this[keys[i]] = properties[keys[i]];
                  }
docs: Properties of a CreateDocumentRequest.
  @memberof google.firestore.v1
  @interface ICreateDocumentRequest
  @property {string|null} [parent] CreateDocumentRequest parent
  @property {string|null} [collectionId] CreateDocumentRequest collectionId
  @property {string|null} [documentId] CreateDocumentRequest documentId
  @property {google.firestore.v1.IDocument|null} [document] CreateDocumentRequest document
  @property {google.firestore.v1.IDocumentMask|null} [mask] CreateDocumentRequest mask
   
  Constructs a new CreateDocumentRequest.
  @memberof google.firestore.v1
  @classdesc Represents a CreateDocumentRequest.
  @implements ICreateDocumentRequest
  @constructor
  @param {google.firestore.v1.ICreateDocumentRequest=} [properties] Properties to set