Remix.asia ... 

git clone git@github.com:firebase/quickstart-android.git

$ git -C ~/AndroidStudioProjects/github/quickstart-android log --diff-filter=D --summary

　：
commit b3c910f8441fdca3f696abb6744b076807fe9fc8
Author: DPEBot 
Date:   Mon Aug 24 09:05:15 2020 -0700

    Auto-update dependencies. (#1159)

    * Auto-update dependencies.

    * deprecating ML-Kit Android samples in favor of Firebase ML

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commit b67f8fcb9a793e34110473991416f3ce872385b5
Author: Sam Stern 
Date:   Wed May 20 15:25:29 2020 -0400

    Delete sdk_bug.md

 delete mode 100644 .github/ISSUE_TEMPLATE/sdk_bug.md
　：

Aug 24 09:05:15 のコミット"b3c910f8441fdca3f696abb6744b076807fe9fc8"で mlkit/* が ごっそり削除。その直前を調べると

$ git -C ~/AndroidStudioProjects/github/quickstart-android log
　：
commit b3c910f8441fdca3f696abb6744b076807fe9fc8 (HEAD -> master)
Author: DPEBot 
Date:   Mon Aug 24 09:05:15 2020 -0700

    Auto-update dependencies. (#1159)

    * Auto-update dependencies.

    * deprecating ML-Kit Android samples in favor of Firebase ML

commit 34283bffb02a7ff9ee1703100c4a9ceefc06e606 ★
Author: Sam Stern 
Date:   Wed Aug 19 05:34:11 2020 -0400

    Add link to MLKit support

commit f2676749632938d536741f2c5b6d668dfea7c4c7
Author: DPEBot 
Date:   Thu Aug 6 10:41:52 2020 -0700

    Auto-update dependencies. (#1157)

    * Auto-update dependencies.
　：

Aug 19 05:34:11 のコミット"34283bffb02a7ff9ee1703100c4a9ceefc06e606"へ戻す

$ git -C ~/AndroidStudioProjects/github/quickstart-android reset --hard 34283bffb02a7ff9ee1703100c4a9ceefc06e606

　求めていた Firebase を使用した MK(Machine Lerning) Kit の javaソースが復元。そのまま Android Studio で リビルド・ランすると実行できず下記エラー。

Unable to determine application id: com.android.tools.idea.run.ApkProvisionException: Error loading build artifacts C:\Users\USER\AndroidStudioProjects\github\quickstart-android\mlkit\app\build\outputs\apk\debug\output-metadata.json

　調べると

Build-> Clean project

Build->Rebuild project

File->Invalidate Cashes /restart-> Invalidate and restart

まですると改善され、実行できる。
　前提：Andorid Studio 4.1.1、Pixel4 (Andorid 11)