Write shard level metadata blob when snapshotting searchable snapshot indexes

[bugmakerrrrrr]

Description

In #7247, we only snapshot the index metadata if the target index is searchable snapshot, so we don't create shard level snapshot metadata under shard blob container (ie. snap-{uuid}.dat blob). But this metadata blob needs to be loaded when getting snapshot status or cloning snapshot. Currently, following exception will be thrown if we call snapshot status api and target snapshot contains searchable snapshot.

SnapshotMissingException[[test-repo:test-repeated-snap-0] is missing
]
	at org.opensearch.repositories.blobstore.BlobStoreRepository.loadShardSnapshot(BlobStoreRepository.java:3418)
	at org.opensearch.repositories.blobstore.BlobStoreRepository.getShardSnapshotStatus(BlobStoreRepository.java:3218)
	at org.opensearch.action.admin.cluster.snapshots.status.TransportSnapshotsStatusAction.snapshotShards(TransportSnapshotsStatusAction.java:450)
	at org.opensearch.action.admin.cluster.snapshots.status.TransportSnapshotsStatusAction.lambda$loadRepositoryData$3(TransportSnapshotsStatusAction.java:348)
	at org.opensearch.core.action.ActionListener$1.onResponse(ActionListener.java:82)
	at org.opensearch.common.util.concurrent.ListenableFuture$1.doRun(ListenableFuture.java:126)
	at org.opensearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:52)
	at org.opensearch.common.util.concurrent.OpenSearchExecutors$DirectExecutorService.execute(OpenSearchExecutors.java:341)
	at org.opensearch.common.util.concurrent.ListenableFuture.notifyListener(ListenableFuture.java:120)
	at org.opensearch.common.util.concurrent.ListenableFuture.addListener(ListenableFuture.java:82)
	at org.opensearch.action.StepListener.whenComplete(StepListener.java:95)
	at org.opensearch.action.admin.cluster.snapshots.status.TransportSnapshotsStatusAction.loadRepositoryData(TransportSnapshotsStatusAction.java:320)
	at org.opensearch.action.admin.cluster.snapshots.status.TransportSnapshotsStatusAction.buildResponse(TransportSnapshotsStatusAction.java:303)
	at org.opensearch.action.admin.cluster.snapshots.status.TransportSnapshotsStatusAction.clusterManagerOperation(TransportSnapshotsStatusAction.java:149)
	at org.opensearch.action.admin.cluster.snapshots.status.TransportSnapshotsStatusAction.clusterManagerOperation(TransportSnapshotsStatusAction.java:90)
	at org.opensearch.action.support.clustermanager.TransportClusterManagerNodeAction.masterOperation(TransportClusterManagerNodeAction.java:177)
	at org.opensearch.action.support.clustermanager.TransportClusterManagerNodeAction.clusterManagerOperation(TransportClusterManagerNodeAction.java:186)
	at org.opensearch.action.support.clustermanager.TransportClusterManagerNodeAction$AsyncSingleAction.lambda$doStart$1(TransportClusterManagerNodeAction.java:292)
	at org.opensearch.action.ActionRunnable$2.doRun(ActionRunnable.java:89)
	at org.opensearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:913)
	at org.opensearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:52)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at java.base/java.lang.Thread.run(Thread.java:833)

We can write the shard level snapshot metadata to resolve this issue.

Related Issues

Resolves #[Issue number to be closed when this PR is merged]

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Failing checks are inspected and point to the corresponding known issue(s) (See: Troubleshooting Failing Builds)
• Commits are signed per the DCO using --signoff
• Commit changes are listed out in CHANGELOG.md file (See: Changelog)
• Public documentation issue/PR created

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[bugmakerrrrrr]

Btw, I have no good idea when reading old snapshot. Maybe when we getting shard snapshot, we can check the snapshot index settings after SnapshotMissingException is thrown, if target index is remote snapshot, then return a empty snapshot status. Any thoughts?

[bugmakerrrrrr]

@andrross you may be interested in this :)

[github-actions]

❌ Gradle check result for 6045092: 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]

Compatibility status:

Checks if related components are compatible with change 6045092

Incompatible components

Skipped components

Compatible components

Compatible components: [https://github.com/opensearch-project/custom-codecs.git, https://github.com/opensearch-project/asynchronous-search.git, https://github.com/opensearch-project/cross-cluster-replication.git, https://github.com/opensearch-project/reporting.git, https://github.com/opensearch-project/job-scheduler.git, https://github.com/opensearch-project/neural-search.git, https://github.com/opensearch-project/flow-framework.git, https://github.com/opensearch-project/geospatial.git, https://github.com/opensearch-project/security-analytics.git, https://github.com/opensearch-project/k-nn.git, https://github.com/opensearch-project/common-utils.git, https://github.com/opensearch-project/notifications.git, https://github.com/opensearch-project/opensearch-oci-object-storage.git, https://github.com/opensearch-project/observability.git, https://github.com/opensearch-project/anomaly-detection.git, https://github.com/opensearch-project/ml-commons.git, https://github.com/opensearch-project/alerting.git, https://github.com/opensearch-project/performance-analyzer-rca.git, https://github.com/opensearch-project/index-management.git, https://github.com/opensearch-project/security.git, https://github.com/opensearch-project/sql.git, https://github.com/opensearch-project/performance-analyzer.git]

[opensearch-trigger-bot]

This PR is stalled because it has been open for 30 days with no activity.

[github-actions]

❌ Gradle check result for 9899f6a: 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 6763bb8: 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?

[bugmakerrrrrr]

@andrross @kotwanikunal would you please have a look when you have a chance and merge this if it is possible

[github-actions]

❌ Gradle check result for 55475a6: 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 d1b94bc: 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 d1b94bc: SUCCESS

[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-13190-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 568c193dd817b76b2f0ca4647bc4e01908db709d
# Push it to GitHub
git push --set-upstream origin backport/backport-13190-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-13190-to-2.x.