[Backport 2.19] Fix ssl hot reload settings (#5117)

Signed-off-by: Andrey Pleskach <[email protected]>
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: opensearch-trigger-bot[bot]

src/main/java/org/opensearch/security/OpenSearchSecurityPlugin.java

@@ -2065,6 +2065,14 @@ public List<Setting<?>> getSettings() {
                 Setting.boolSetting(ConfigConstants.SECURITY_UNSUPPORTED_LOAD_STATIC_RESOURCES, true, Property.NodeScope, Property.Filtered)
             );
             settings.add(Setting.boolSetting(SECURITY_SSL_CERT_RELOAD_ENABLED, false, Property.NodeScope, Property.Filtered));
+            settings.add(
+                Setting.boolSetting(
+                    ConfigConstants.SECURITY_SSL_CERTIFICATES_HOT_RELOAD_ENABLED,
+                    false,
+                    Property.NodeScope,
+                    Property.Filtered
+                )
+            );
             settings.add(
                 Setting.boolSetting(
                     ConfigConstants.SECURITY_UNSUPPORTED_ACCEPT_INVALID_CONFIG,