Update AuditConfig.DEPRECATED_KEYS deprecation message to match 4.0 (#5155)

Signed-off-by: shikharj05 <[email protected]>
Co-authored-by: Darshit Chanpura <[email protected]>

Author: shikharj05

src/main/java/org/opensearch/security/auditlog/config/AuditConfig.java

@@ -542,6 +542,7 @@ public String toString() {
     /**
      * List of keys that are deprecated
      */
+    @Deprecated
     public static final List<String> DEPRECATED_KEYS = ImmutableList.of(
         ConfigConstants.OPENDISTRO_SECURITY_AUDIT_ENABLE_REST,
         ConfigConstants.OPENDISTRO_SECURITY_AUDIT_CONFIG_DISABLED_REST_CATEGORIES,

src/main/java/org/opensearch/security/configuration/ConfigurationRepository.java

@@ -307,7 +307,7 @@ private void setupAuditConfigurationIfAny(final boolean auditConfigDocPresent) {
         final Set<String> deprecatedAuditKeysInSettings = AuditConfig.getDeprecatedKeys(settings);
         if (!deprecatedAuditKeysInSettings.isEmpty()) {
             LOGGER.warn(
-                "Following keys {} are deprecated in opensearch settings. They will be removed in plugin v2.0.0.0",
+                "Following keys {} are deprecated in opensearch settings. They will be removed in plugin v4.0.0.0",
                 deprecatedAuditKeysInSettings
             );
         }