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Follow the guide to enable codebase context checks.

Objective: Ensure all identifiers clearly express their purpose and intent, making code
self-documenting

Status: Passed

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Objective: Ensure comprehensive error handling that provides meaningful context and graceful
degradation

Status: Passed

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Objective: To prevent the leakage of sensitive system information through error messages while
providing sufficient detail for internal debugging.

Status: Passed

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Objective: To ensure logs are useful for debugging and auditing without exposing sensitive
information like PII, PHI, or cardholder data.

Status: Passed

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Objective: To create a detailed and reliable record of critical system actions for security analysis
and compliance.

Status:
Logging Context: The PR adds warn-level logs for node failures, but does not include explicit user identity
or structured fields, making it unclear if audit requirements are met for these critical
actions.

    logger.atWarn().withThrowable(failure).log("node {} failed to run deprecation checks", failure.nodeId());
}

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Objective: Ensure all data inputs are validated, sanitized, and handled securely to prevent
vulnerabilities

Status:
Input Assumptions: The change replaces stream filtering with a loop and processes deprecation checks without
visible validation of external inputs (e.g., settings or cluster info), which may rely on
validations outside the shown diff.

List<DeprecationIssue> issues = new ArrayList<>();
for (NodeDeprecationChecks.NodeDeprecationCheck<
    Settings,
    PluginsAndModules,
    ClusterState,
    XPackLicenseState,
    DeprecationIssue> c : nodeSettingsChecks) {
    DeprecationIssue deprecationIssue = c.apply(filteredNodeSettings, pluginsService.info(), filteredClusterState, licenseState);
    if (deprecationIssue != null) {
        issues.add(deprecationIssue);
    }
}
DeprecationIssue watermarkIssue = checkDiskLowWatermark(

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Simplify the matches method by using instanceof pattern matching to combine the
type check and variable binding into a single, more concise step.

x-pack/plugin/deprecation/src/test/java/org/elasticsearch/xpack/deprecation/TransportNodeDeprecationCheckActionTests.java [289-296]

 @Override
 public boolean matches(Object actual) {
-    if (actual instanceof DeprecationIssue == false) {
-        return false;
+    if (actual instanceof DeprecationIssue actualDeprecationIssue) {
+        return level.equals(actualDeprecationIssue.getLevel()) && messageMatcher.matches(actualDeprecationIssue.getMessage());
     }
-    DeprecationIssue actualDeprecationIssue = (DeprecationIssue) actual;
-    return level.equals(actualDeprecationIssue.getLevel()) && messageMatcher.matches(actualDeprecationIssue.getMessage());
+    return false;
 }

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