Gives INVALID_ARGUMENT error when pushing a new unstructured data into datastore

Hi All, So I am new to google vertex AI search, So I was doing some hands-on of creating a new unstructured document(pdf in my case) and push that document to already created data store which already have some unstructured documents.

so When I hit the below custom API from postman https://discoveryengine.googleapis.com/v1alpha/projects/548443691128/locations/global/collections/default_collection/dataStores/kaggle-movie_1698160258041/branches/0/documents

and added documentId = 01 in params then I get INVALID_ARGUMENT error postman error

Below is the format of the unstructured document that I created by following

https://cloud.google.com/discovery-engine/docs/reference/rest/v1alpha/projects.locations.collections.dataStores.branches.documents#content

{
    "name": "projects/548443691128/locations/global/collections/default_collection/dataStores/alphabet-investor_1698161197344/branches/0/documents/01",
    "id": "01",
    "schemaId": "default_schema",
    "structData": {},
    "parentDocumentId": "01",
    "content": {
        "mimeType": "application/pdf",
        "uri": "gs://personal-beta/testing-doc/Global iJobs Policy.pdf"
    }
}

In this case the document name Global iJobs Policy.pdf is present in the google cloud storage bucket. I think there might be some problem with the format of the document, but I am not able to figure out.

I tried following the officials documentation but did not get any hint about, what could have gone wrong.

Here's the REST API sample for how to import data from Cloud Storage after creating a data store using the Cloud Console.

You will need to use the import method of the projects.locations.collections.dataStores.branches.documents resource.

https://cloud.google.com/generative-ai-app-builder/docs/create-data-store-es#discoveryengine_v1_generated_DocumentService_ImportDocuments_sync-drest