Fix fs info reporting negative available size

[bugmakerrrrrr]

Description

Today, the fs info may report a negative available size, which happens when the following conditions are met:

1. A node has both data and search roles.
2. Some space is reserved for file cache.
3. The file cache space is being used by other files, primarily local indices files.

Related exception:

java.lang.IllegalArgumentException: Values less than -1 bytes are not supported: -1781760b
	at org.opensearch.core.common.unit.ByteSizeValue.<init>(ByteSizeValue.java:78) ~[classes/:?]
	at org.opensearch.core.common.unit.ByteSizeValue.<init>(ByteSizeValue.java:73) ~[classes/:?]
	at org.opensearch.monitor.fs.FsInfo$Path.getAvailable(FsInfo.java:141) ~[classes/:?]
	at org.opensearch.cluster.InternalClusterInfoService.fillDiskUsagePerNode(InternalClusterInfoService.java:452) ~[classes/:?]
	at org.opensearch.cluster.InternalClusterInfoService$1.onResponse(InternalClusterInfoService.java:265) ~[classes/:?]
	at org.opensearch.cluster.InternalClusterInfoService$1.onResponse(InternalClusterInfoService.java:260) [classes/:?]
	at org.opensearch.action.LatchedActionListener.onResponse(LatchedActionListener.java:58) [classes/:?]
	at org.opensearch.action.support.TransportAction$1.onResponse(TransportAction.java:113) ~[classes/:?]
	at org.opensearch.action.support.TransportAction$1.onResponse(TransportAction.java:107) [classes/:?]
	at org.opensearch.action.ActionRunnable.lambda$supply$0(ActionRunnable.java:74) [classes/:?]
	at org.opensearch.action.ActionRunnable$2.doRun(ActionRunnable.java:89) ~[classes/:?]
	at org.opensearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:52) [classes/:?]
	at org.opensearch.common.util.concurrent.OpenSearchExecutors$DirectExecutorService.execute(OpenSearchExecutors.java:341) [classes/:?]
	at org.opensearch.action.support.nodes.TransportNodesAction$AsyncAction.finishHim(TransportNodesAction.java:315) [classes/:?]

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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[github-actions]

Compatibility status:

Checks if related components are compatible with change 0ac9db3

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

[github-actions]

❌ Gradle check result for cf2596f: null

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?

[kotwanikunal]

Thanks for the changes @bugmakerrrrrr. Can you please add in a changelog entry in the 2.x section?

[github-actions]

✅ Gradle check result for 35e1721: SUCCESS

[github-actions]

❕ Gradle check result for e354303: UNSTABLE

• TEST FAILURES:

      1 org.opensearch.http.SearchRestCancellationIT.testAutomaticCancellationMultiSearchDuringFetchPhase
      1 org.opensearch.http.SearchRestCancellationIT.testAutomaticCancellationDuringQueryPhase
      1 org.opensearch.http.SearchRestCancellationIT.classMethod
      1 org.opensearch.cluster.MinimumClusterManagerNodesIT.testThreeNodesNoClusterManagerBlock

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

[github-actions]

❌ Gradle check result for 1bae5b8: 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 1bae5b8: SUCCESS

[github-actions]

❌ Gradle check result for 5514e03: 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 5514e03: SUCCESS