Update save_data_batch_writes.go

[asoto31]

client.Batch() is deprecated: https://pkg.go.dev/cloud.google.com/go/firestore#Client.Batch

Instead client.BulkWriter() should be documented: https://pkg.go.dev/cloud.google.com/go/firestore#Client.BulkWriter

Description

Fixes # b/255272655

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Checklist

• I have followed Contributing Guidelines from CONTRIBUTING.MD
• Please merge this PR for me once it is approved

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[gemini-code-assist]

Summary of Changes

Hello @asoto31, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates a Go sample for Google Cloud Firestore to reflect current best practices by replacing a deprecated API call. Specifically, it migrates the batchWrite function from using the older client.Batch() method to the recommended client.BulkWriter(ctx) for performing batch writes, ensuring the sample remains up-to-date and functional with the latest client library.

Highlights

• API Usage Update: The batchWrite function in the firestore/save_data_batch_writes.go sample has been updated to use client.BulkWriter(ctx) instead of the deprecated client.Batch() method.

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[gemini-code-assist]

Code Review

This pull request correctly updates the deprecated client.Batch() to client.BulkWriter(). However, this change introduces a compilation error because the API for BulkWriter is different from WriteBatch. Specifically, BulkWriter does not have a Commit method, which is used later in the function. My review includes a detailed comment on how to fix this and other related considerations for using BulkWriter correctly.

[asoto31]

Please review and approve