Support for Google Application Default Credentials

[fahadshamiinsta]

Description

This change provides the support for Application Default Credentials for the repository-gcs plugin to support the snapshot api requests.
The solution uses the existent google auth library. The google client is instantiated being wrapped in a doPrivileged block i.e using SocketAccess class to avoid Access Denied errors and to connect to google cloud services.

Related Issues

Resolves #8375

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff
• Commit changes are listed out in CHANGELOG.md file (See: Changelog)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/18904/
• CommitID: a99963f
  Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green.
  Is the failure a flaky test unrelated to your change?

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/18905/
• CommitID: 3bd86e1
  Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green.
  Is the failure a flaky test unrelated to your change?

[dblock]

Assuming it works (see comment below), this needs at the very least tests, please.

[peternied]

Thanks for creating this pull request - I'll take another look after tests have been added.

[opensearch-trigger-bot]

This PR is stalled because it has been open for 30 days with no activity. Remove stalled label or comment or this will be closed in 7 days.

[github-actions]

❌ Gradle check result for a10ffa5: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

❌ Gradle check result for 736b2f2: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[fahadshamiinsta]

FAILURE

#10006

[github-actions]

❌ Gradle check result for ae2f832: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

❕ Gradle check result for 21a2ffb: UNSTABLE

• TEST FAILURES:

      1 org.opensearch.search.SearchWeightedRoutingIT.testMultiGetWithNetworkDisruption_FailOpenEnabled

Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[fahadshamiinsta]

Close! I have some naming asks, I think the way the classes and methods are named is incorrect.

Iterate to green please!

Is there a doc on how to use this? Do we need to write one?

@dblock please have another look:
I have referenced the flaky tests to the PR,
added another test to increase the coverage for GoogleApplicationDefaultCredentials ,
provided a link to the google doc in the class comment for default credentials,
I had to do extra commits to trigger the ci checks (not sure if there is another way)

[opensearch-trigger-bot]

The backport to 2.x failed:

The process '/usr/bin/git' failed with exit code 128

To backport manually, run these commands in your terminal:

# Navigate to the root of your repository
cd $(git rev-parse --show-toplevel)
# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/OpenSearch/backport-2.x 2.x
# Navigate to the new working tree
pushd ../.worktrees/OpenSearch/backport-2.x
# Create a new branch
git switch --create backport/backport-8394-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 4c283a7c79b20e73ccf3378124893451197b85a3
# Push it to GitHub
git push --set-upstream origin backport/backport-8394-to-2.x
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/OpenSearch/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-8394-to-2.x.

[dblock]

@fahadshamiinsta you will need to manually backport this if you want it in the next 2.x release (2.12)