diff --git a/build.gradle b/build.gradle
index c7054ca94c..cf10edeef2 100644
--- a/build.gradle
+++ b/build.gradle
@@ -379,6 +379,12 @@ tasks.withType(Checkstyle) {
     }
 }
 
+tasks.withType(JavaCompile) {
+    configure(options) {
+        options.compilerArgs << '-Xlint:removal' << '-Werror'
+    }
+}
+
 spotless {
   java {
     // note: you can use an empty string for all the imports you didn't specify explicitly, and '\\#` prefix for static imports
diff --git a/src/main/java/com/amazon/dlic/auth/http/jwt/AbstractHTTPJwtAuthenticator.java b/src/main/java/com/amazon/dlic/auth/http/jwt/AbstractHTTPJwtAuthenticator.java
index a75810c83d..49fc70ed61 100644
--- a/src/main/java/com/amazon/dlic/auth/http/jwt/AbstractHTTPJwtAuthenticator.java
+++ b/src/main/java/com/amazon/dlic/auth/http/jwt/AbstractHTTPJwtAuthenticator.java
@@ -78,6 +78,7 @@ public AbstractHTTPJwtAuthenticator(Settings settings, Path configPath) {
     }
 
     @Override
+    @SuppressWarnings("removal")
     public AuthCredentials extractCredentials(RestRequest request, ThreadContext context)
             throws OpenSearchSecurityException {
         final SecurityManager sm = System.getSecurityManager();
diff --git a/src/main/java/com/amazon/dlic/auth/http/jwt/HTTPJwtAuthenticator.java b/src/main/java/com/amazon/dlic/auth/http/jwt/HTTPJwtAuthenticator.java
index 0b827bab76..131db394ea 100644
--- a/src/main/java/com/amazon/dlic/auth/http/jwt/HTTPJwtAuthenticator.java
+++ b/src/main/java/com/amazon/dlic/auth/http/jwt/HTTPJwtAuthenticator.java
@@ -114,6 +114,7 @@ public HTTPJwtAuthenticator(final Settings settings, final Path configPath) {
 
 
     @Override
+    @SuppressWarnings("removal")
     public AuthCredentials extractCredentials(RestRequest request, ThreadContext context) throws OpenSearchSecurityException {
         final SecurityManager sm = System.getSecurityManager();
 
diff --git a/src/main/java/com/amazon/dlic/auth/http/kerberos/HTTPSpnegoAuthenticator.java b/src/main/java/com/amazon/dlic/auth/http/kerberos/HTTPSpnegoAuthenticator.java
index 8e4bae67f3..aade6697a1 100644
--- a/src/main/java/com/amazon/dlic/auth/http/kerberos/HTTPSpnegoAuthenticator.java
+++ b/src/main/java/com/amazon/dlic/auth/http/kerberos/HTTPSpnegoAuthenticator.java
@@ -70,6 +70,7 @@ public class HTTPSpnegoAuthenticator implements HTTPAuthenticator {
     private Set<String> acceptorPrincipal;
     private Path acceptorKeyTabPath;
 
+    @SuppressWarnings("removal")
     public HTTPSpnegoAuthenticator(final Settings settings, final Path configPath) {
         super();
         try {
@@ -165,6 +166,7 @@ public Void run() {
     }
 
     @Override
+    @SuppressWarnings("removal")
     public AuthCredentials extractCredentials(final RestRequest request, ThreadContext threadContext) {
         final SecurityManager sm = System.getSecurityManager();
 
diff --git a/src/main/java/com/amazon/dlic/auth/http/saml/AuthTokenProcessorHandler.java b/src/main/java/com/amazon/dlic/auth/http/saml/AuthTokenProcessorHandler.java
index 54d909d959..4436fe8130 100644
--- a/src/main/java/com/amazon/dlic/auth/http/saml/AuthTokenProcessorHandler.java
+++ b/src/main/java/com/amazon/dlic/auth/http/saml/AuthTokenProcessorHandler.java
@@ -125,6 +125,7 @@ class AuthTokenProcessorHandler {
 
     }
 
+    @SuppressWarnings("removal")
     boolean handle(RestRequest restRequest, RestChannel restChannel) throws Exception {
         try {
             final SecurityManager sm = System.getSecurityManager();
diff --git a/src/main/java/com/amazon/dlic/auth/http/saml/HTTPSamlAuthenticator.java b/src/main/java/com/amazon/dlic/auth/http/saml/HTTPSamlAuthenticator.java
index d26ad879c3..9404b1cec1 100644
--- a/src/main/java/com/amazon/dlic/auth/http/saml/HTTPSamlAuthenticator.java
+++ b/src/main/java/com/amazon/dlic/auth/http/saml/HTTPSamlAuthenticator.java
@@ -258,6 +258,7 @@ public void destroy() {
         }
     }
 
+    @SuppressWarnings("removal")
     static void ensureOpenSamlInitialization() {
         if (openSamlInitialized) {
             return;
@@ -299,6 +300,7 @@ public Void run() throws InitializationException {
         }
     }
 
+    @SuppressWarnings("removal")
     private MetadataResolver createMetadataResolver(final Settings settings, final Path configPath)
             throws Exception {
         final AbstractMetadataResolver metadataResolver;
diff --git a/src/main/java/com/amazon/dlic/auth/http/saml/Saml2SettingsProvider.java b/src/main/java/com/amazon/dlic/auth/http/saml/Saml2SettingsProvider.java
index d4d250ed56..8081921494 100644
--- a/src/main/java/com/amazon/dlic/auth/http/saml/Saml2SettingsProvider.java
+++ b/src/main/java/com/amazon/dlic/auth/http/saml/Saml2SettingsProvider.java
@@ -67,6 +67,7 @@ public class Saml2SettingsProvider {
         this.spSignaturePrivateKey = spSignaturePrivateKey;
     }
 
+    @SuppressWarnings("removal")
     Saml2Settings get() throws SamlConfigException {
         try {
             HashMap<String, Object> configProperties = new HashMap<>();
diff --git a/src/main/java/com/amazon/dlic/auth/http/saml/SamlFilesystemMetadataResolver.java b/src/main/java/com/amazon/dlic/auth/http/saml/SamlFilesystemMetadataResolver.java
index 40984bd058..c6646c67a1 100644
--- a/src/main/java/com/amazon/dlic/auth/http/saml/SamlFilesystemMetadataResolver.java
+++ b/src/main/java/com/amazon/dlic/auth/http/saml/SamlFilesystemMetadataResolver.java
@@ -34,6 +34,7 @@ public class SamlFilesystemMetadataResolver extends FilesystemMetadataResolver {
     }
 
     @Override
+    @SuppressWarnings("removal")
     protected byte[] fetchMetadata() throws ResolverException {
         try {
             return AccessController.doPrivileged(new PrivilegedExceptionAction<byte[]>() {
diff --git a/src/main/java/com/amazon/dlic/auth/http/saml/SamlHTTPMetadataResolver.java b/src/main/java/com/amazon/dlic/auth/http/saml/SamlHTTPMetadataResolver.java
index 26588d9a7f..da31310062 100644
--- a/src/main/java/com/amazon/dlic/auth/http/saml/SamlHTTPMetadataResolver.java
+++ b/src/main/java/com/amazon/dlic/auth/http/saml/SamlHTTPMetadataResolver.java
@@ -41,6 +41,7 @@ public class SamlHTTPMetadataResolver extends HTTPMetadataResolver {
     }
 
     @Override
+    @SuppressWarnings("removal")
     protected byte[] fetchMetadata() throws ResolverException {
         try {
             return AccessController.doPrivileged(new PrivilegedExceptionAction<byte[]>() {
@@ -64,6 +65,7 @@ private static SettingsBasedSSLConfigurator.SSLConfig getSSLConfig(Settings sett
         return new SettingsBasedSSLConfigurator(settings, configPath, "idp").buildSSLConfig();
     }
 
+    @SuppressWarnings("removal")
     private static HttpClient createHttpClient(Settings settings, Path configPath) throws Exception {
         try {
             final SecurityManager sm = System.getSecurityManager();
diff --git a/src/main/java/com/amazon/dlic/auth/ldap/backend/LDAPAuthorizationBackend.java b/src/main/java/com/amazon/dlic/auth/ldap/backend/LDAPAuthorizationBackend.java
index 32e0b67965..3aeb9e36ff 100755
--- a/src/main/java/com/amazon/dlic/auth/ldap/backend/LDAPAuthorizationBackend.java
+++ b/src/main/java/com/amazon/dlic/auth/ldap/backend/LDAPAuthorizationBackend.java
@@ -117,6 +117,7 @@ public LDAPAuthorizationBackend(final Settings settings, final Path configPath)
         this.userBaseSettings = LDAPAuthenticationBackend.getUserBaseSettings(settings);
     }
 
+    @SuppressWarnings("removal")
     public static void checkConnection(final ConnectionConfig connectionConfig, String bindDn, byte[] password) throws Exception {
 
         final SecurityManager sm = System.getSecurityManager();
@@ -146,6 +147,7 @@ public Void run() throws Exception {
 
     }
 
+    @SuppressWarnings("removal")
     public static Connection getConnection(final Settings settings, final Path configPath) throws Exception {
 
         final SecurityManager sm = System.getSecurityManager();
@@ -201,7 +203,7 @@ private static List<Map.Entry<String, Settings>> convertOldStyleSettingsToNewSty
         return Collections.singletonList(result.entrySet().iterator().next());
     }
 
-    @SuppressWarnings("unchecked")
+    @SuppressWarnings("removal")
     private static void checkConnection0(final ConnectionConfig connectionConfig, String bindDn, byte[] password, final ClassLoader cl,
                                          final boolean needRestore) throws KeyStoreException, NoSuchAlgorithmException, CertificateException,
                                          FileNotFoundException, IOException, LdapException {
@@ -244,7 +246,6 @@ public Void run() throws Exception {
         }
     }
 
-    @SuppressWarnings("unchecked")
     private static Connection getConnection0(final Settings settings, final Path configPath, final ClassLoader cl,
             final boolean needRestore) throws KeyStoreException, NoSuchAlgorithmException, CertificateException,
             FileNotFoundException, IOException, LdapException {
@@ -477,6 +478,7 @@ private void restoreClassLoader() {
         };
     }
 
+    @SuppressWarnings("removal")
     private static void restoreClassLoader0(final ClassLoader cl) {
         try {
             AccessController.doPrivileged(new PrivilegedExceptionAction<Void>() {
diff --git a/src/main/java/com/amazon/dlic/auth/ldap/util/LdapHelper.java b/src/main/java/com/amazon/dlic/auth/ldap/util/LdapHelper.java
index a525e5d863..133f337386 100644
--- a/src/main/java/com/amazon/dlic/auth/ldap/util/LdapHelper.java
+++ b/src/main/java/com/amazon/dlic/auth/ldap/util/LdapHelper.java
@@ -43,6 +43,7 @@
 public class LdapHelper {
 
     private static SearchFilter ALL = new SearchFilter("(objectClass=*)");
+    @SuppressWarnings("removal")
     public static List<LdapEntry> search(final Connection conn, final String unescapedDn, SearchFilter filter,
             final SearchScope searchScope) throws LdapException {
 
diff --git a/src/main/java/com/amazon/dlic/auth/ldap/util/Utils.java b/src/main/java/com/amazon/dlic/auth/ldap/util/Utils.java
index 72f39dcccf..69a00770ee 100644
--- a/src/main/java/com/amazon/dlic/auth/ldap/util/Utils.java
+++ b/src/main/java/com/amazon/dlic/auth/ldap/util/Utils.java
@@ -41,6 +41,7 @@ private Utils() {
 
     }
 
+    @SuppressWarnings("removal")
     public static void unbindAndCloseSilently(final Connection connection) {
         if (connection == null) {
             return;
diff --git a/src/main/java/com/amazon/dlic/auth/ldap2/LDAPAuthenticationBackend2.java b/src/main/java/com/amazon/dlic/auth/ldap2/LDAPAuthenticationBackend2.java
index 3255537219..9dfac4231c 100755
--- a/src/main/java/com/amazon/dlic/auth/ldap2/LDAPAuthenticationBackend2.java
+++ b/src/main/java/com/amazon/dlic/auth/ldap2/LDAPAuthenticationBackend2.java
@@ -85,6 +85,7 @@ public LDAPAuthenticationBackend2(final Settings settings, final Path configPath
     }
 
     @Override
+    @SuppressWarnings("removal")
     public User authenticate(final AuthCredentials credentials) throws OpenSearchSecurityException {
         final SecurityManager sm = System.getSecurityManager();
 
@@ -184,6 +185,7 @@ public String getType() {
         return "ldap";
     }
 
+    @SuppressWarnings("removal")
     @Override
     public boolean exists(final User user) {
         final SecurityManager sm = System.getSecurityManager();
@@ -230,6 +232,7 @@ private boolean exists0(final User user) {
         }
     }
 
+    @SuppressWarnings("removal")
     private void authenticateByLdapServer(final Connection connection, final String dn, byte[] password)
             throws LdapException {
         final SecurityManager sm = System.getSecurityManager();
diff --git a/src/main/java/com/amazon/dlic/auth/ldap2/LDAPAuthorizationBackend2.java b/src/main/java/com/amazon/dlic/auth/ldap2/LDAPAuthorizationBackend2.java
index 118848460b..86b70476c6 100755
--- a/src/main/java/com/amazon/dlic/auth/ldap2/LDAPAuthorizationBackend2.java
+++ b/src/main/java/com/amazon/dlic/auth/ldap2/LDAPAuthorizationBackend2.java
@@ -120,6 +120,7 @@ private static List<Map.Entry<String, Settings>> convertOldStyleSettingsToNewSty
         return Collections.singletonList(result.entrySet().iterator().next());
     }
 
+    @SuppressWarnings("removal")
     @Override
     public void fillRoles(final User user, final AuthCredentials optionalAuthCreds)
             throws OpenSearchSecurityException {
diff --git a/src/main/java/com/amazon/dlic/auth/ldap2/MakeJava9Happy.java b/src/main/java/com/amazon/dlic/auth/ldap2/MakeJava9Happy.java
index 3f6e77ec07..57bc72710d 100644
--- a/src/main/java/com/amazon/dlic/auth/ldap2/MakeJava9Happy.java
+++ b/src/main/java/com/amazon/dlic/auth/ldap2/MakeJava9Happy.java
@@ -29,6 +29,7 @@ public class MakeJava9Happy {
     private static ClassLoader classLoader;
     private static boolean isJava9OrHigher = PlatformDependent.javaVersion() >= 9;;
 
+    @SuppressWarnings("removal")
     static ClassLoader getClassLoader() {
         if (!isJava9OrHigher) {
             return null;
diff --git a/src/main/java/com/amazon/dlic/auth/ldap2/PrivilegedProvider.java b/src/main/java/com/amazon/dlic/auth/ldap2/PrivilegedProvider.java
index a0650e6f2d..d6ed283241 100644
--- a/src/main/java/com/amazon/dlic/auth/ldap2/PrivilegedProvider.java
+++ b/src/main/java/com/amazon/dlic/auth/ldap2/PrivilegedProvider.java
@@ -85,6 +85,7 @@ public JndiProviderConfig getProviderConfig() {
         }
 
         @Override
+        @SuppressWarnings("removal")
         public ProviderConnection create() throws LdapException {
             final SecurityManager sm = System.getSecurityManager();
 
@@ -121,6 +122,7 @@ public PrivilegedProviderConnection(ProviderConnection delegate, JndiProviderCon
             this.jndiProviderConfig = jndiProviderConfig;
         }
 
+        @SuppressWarnings("removal")
         public Response<Void> bind(BindRequest request) throws LdapException {
             final SecurityManager sm = System.getSecurityManager();
 
diff --git a/src/main/java/org/opensearch/security/DefaultObjectMapper.java b/src/main/java/org/opensearch/security/DefaultObjectMapper.java
index daf3331955..d2dacee9ee 100644
--- a/src/main/java/org/opensearch/security/DefaultObjectMapper.java
+++ b/src/main/java/org/opensearch/security/DefaultObjectMapper.java
@@ -100,6 +100,7 @@ public static <T> T getOrDefault(Map<String, Object> properties, String key, T d
         return value != null ? value : defaultValue;
     }
 
+    @SuppressWarnings("removal")
     public static <T> T readTree(JsonNode node, Class<T> clazz) throws IOException {
 
         final SecurityManager sm = System.getSecurityManager();
@@ -120,6 +121,7 @@ public T run() throws Exception {
         }
     }
     
+    @SuppressWarnings("removal")
     public static <T> T readValue(String string, Class<T> clazz) throws IOException {
 
         final SecurityManager sm = System.getSecurityManager();
@@ -140,6 +142,7 @@ public T run() throws Exception {
         }
     }
     
+    @SuppressWarnings("removal")
     public static JsonNode readTree(String string) throws IOException {
 
         final SecurityManager sm = System.getSecurityManager();
@@ -160,6 +163,7 @@ public JsonNode run() throws Exception {
         }
     }
 
+    @SuppressWarnings("removal")
     public static String writeValueAsString(Object value, boolean omitDefaults) throws JsonProcessingException {
 
         final SecurityManager sm = System.getSecurityManager();
@@ -181,6 +185,7 @@ public String run() throws Exception {
 
     }
 
+    @SuppressWarnings("removal")
     public static <T> T readValue(String string, TypeReference<T> tr) throws IOException {
 
         final SecurityManager sm = System.getSecurityManager();
@@ -202,6 +207,7 @@ public T run() throws Exception {
 
     }
 
+    @SuppressWarnings("removal")
     public static <T> T readValue(String string, JavaType jt) throws IOException {
 
         final SecurityManager sm = System.getSecurityManager();
diff --git a/src/main/java/org/opensearch/security/NonValidatingObjectMapper.java b/src/main/java/org/opensearch/security/NonValidatingObjectMapper.java
index 06da407c80..c98ccdf9bb 100644
--- a/src/main/java/org/opensearch/security/NonValidatingObjectMapper.java
+++ b/src/main/java/org/opensearch/security/NonValidatingObjectMapper.java
@@ -59,6 +59,7 @@ public static void inject(final InjectableValues.Std injectableValues) {
         nonValidatingObjectMapper.setInjectableValues(injectableValues);
     }
 
+    @SuppressWarnings("removal")
     public static <T> T readValue(String string, JavaType jt) throws IOException {
 
         final SecurityManager sm = System.getSecurityManager();
diff --git a/src/main/java/org/opensearch/security/OpenSearchSecurityPlugin.java b/src/main/java/org/opensearch/security/OpenSearchSecurityPlugin.java
index 2ba04baec2..301f6892b6 100644
--- a/src/main/java/org/opensearch/security/OpenSearchSecurityPlugin.java
+++ b/src/main/java/org/opensearch/security/OpenSearchSecurityPlugin.java
@@ -258,6 +258,7 @@ private static boolean isSslCertReloadEnabled(final Settings settings) {
         return settings.getAsBoolean(ConfigConstants.SECURITY_SSL_CERT_RELOAD_ENABLED, false);
     }
 
+    @SuppressWarnings("removal")
     public OpenSearchSecurityPlugin(final Settings settings, final Path configPath) {
         super(settings, configPath, isDisabled(settings));
 
diff --git a/src/main/java/org/opensearch/security/auditlog/impl/AbstractAuditLog.java b/src/main/java/org/opensearch/security/auditlog/impl/AbstractAuditLog.java
index b201bd0957..c24fde1a7e 100644
--- a/src/main/java/org/opensearch/security/auditlog/impl/AbstractAuditLog.java
+++ b/src/main/java/org/opensearch/security/auditlog/impl/AbstractAuditLog.java
@@ -79,6 +79,7 @@
 
 import static org.opensearch.common.xcontent.DeprecationHandler.THROW_UNSUPPORTED_OPERATION;
 
+
 public abstract class AbstractAuditLog implements AuditLog {
     protected final Logger log = LogManager.getLogger(this.getClass());
 
@@ -508,6 +509,7 @@ public void logDocumentDeleted(ShardId shardId, Delete delete, DeleteResult resu
         save(msg);
     }
 
+    @SuppressWarnings("removal")
     protected void logExternalConfig() {
 
         final ComplianceConfig complianceConfig = getComplianceConfig();
diff --git a/src/main/java/org/opensearch/security/auditlog/impl/AuditLogImpl.java b/src/main/java/org/opensearch/security/auditlog/impl/AuditLogImpl.java
index 6a9c131eda..0c6043e1a1 100644
--- a/src/main/java/org/opensearch/security/auditlog/impl/AuditLogImpl.java
+++ b/src/main/java/org/opensearch/security/auditlog/impl/AuditLogImpl.java
@@ -59,6 +59,7 @@ public AuditLogImpl(final Settings settings,
 		this(settings, configPath, clientProvider, threadPool, resolver, clusterService, null);
 	}
 
+    @SuppressWarnings("removal")
 	public AuditLogImpl(final Settings settings,
 						final Path configPath,
 						final Client clientProvider,
@@ -103,6 +104,7 @@ private Boolean removeShutdownHook() {
     }
 
     @Override
+    @SuppressWarnings("removal")
     public void close() throws IOException {
 
         log.info("Closing {}", getClass().getSimpleName());
diff --git a/src/main/java/org/opensearch/security/auditlog/sink/KafkaSink.java b/src/main/java/org/opensearch/security/auditlog/sink/KafkaSink.java
index 2d3a1fdede..46035ea037 100644
--- a/src/main/java/org/opensearch/security/auditlog/sink/KafkaSink.java
+++ b/src/main/java/org/opensearch/security/auditlog/sink/KafkaSink.java
@@ -41,6 +41,7 @@ public class KafkaSink extends AuditLogSink {
 	private Producer<Long, String> producer;
 	private String topicName;
 
+    @SuppressWarnings("removal")
 	public KafkaSink(final String name, final Settings settings, final String settingsPrefix, AuditLogSink fallbackSink) {
 		super(name, settings, settingsPrefix, fallbackSink);
 
diff --git a/src/main/java/org/opensearch/security/auditlog/sink/WebhookSink.java b/src/main/java/org/opensearch/security/auditlog/sink/WebhookSink.java
index bdb00a8bfb..a2fbf33de3 100644
--- a/src/main/java/org/opensearch/security/auditlog/sink/WebhookSink.java
+++ b/src/main/java/org/opensearch/security/auditlog/sink/WebhookSink.java
@@ -102,6 +102,7 @@ public WebhookSink(final String name, final Settings settings, final String sett
 	}
 
 	@Override
+    @SuppressWarnings("removal")
 	public boolean doStore(AuditMessage msg) {
 		if (Strings.isEmpty(webhookUrl)) {
 			log.debug("Webhook URL is null");
@@ -299,6 +300,7 @@ protected boolean doPost(String url, String payload) {
 		}
 	}
 
+    @SuppressWarnings("removal")
 	private KeyStore getEffectiveKeyStore(final Path configPath) {
 
 		return AccessController.doPrivileged(new PrivilegedAction<KeyStore>() {
diff --git a/src/main/java/org/opensearch/security/configuration/DlsFlsValveImpl.java b/src/main/java/org/opensearch/security/configuration/DlsFlsValveImpl.java
index bd8219eac0..7526086508 100644
--- a/src/main/java/org/opensearch/security/configuration/DlsFlsValveImpl.java
+++ b/src/main/java/org/opensearch/security/configuration/DlsFlsValveImpl.java
@@ -562,6 +562,7 @@ private static <T> Field getFieldPrivileged(Class<T> cls, String name) {
             }
         }
 
+        @SuppressWarnings("removal")
         private static <T> Field getField(Class<T> cls, String name) {
             SpecialPermission.check();
             return AccessController.doPrivileged((PrivilegedAction<Field>) () -> getFieldPrivileged(cls, name));
diff --git a/src/main/java/org/opensearch/security/dlic/rest/support/Utils.java b/src/main/java/org/opensearch/security/dlic/rest/support/Utils.java
index 28f5c204e6..24223c3845 100644
--- a/src/main/java/org/opensearch/security/dlic/rest/support/Utils.java
+++ b/src/main/java/org/opensearch/security/dlic/rest/support/Utils.java
@@ -137,6 +137,7 @@ public static <T> T serializeToXContentToPojo(String jsonContent, Class<T> clazz
 
     }
 
+    @SuppressWarnings("removal")
     public static byte[] jsonMapToByteArray(Map<String, Object> jsonAsMap) throws IOException {
 
         final SecurityManager sm = System.getSecurityManager();
@@ -163,6 +164,7 @@ public byte[] run() throws Exception {
         }
     }
 
+    @SuppressWarnings("removal")
     public static Map<String, Object> byteArrayToMutableJsonMap(byte[] jsonBytes) throws IOException {
 
         final SecurityManager sm = System.getSecurityManager();
diff --git a/src/main/java/org/opensearch/security/ssl/DefaultSecurityKeyStore.java b/src/main/java/org/opensearch/security/ssl/DefaultSecurityKeyStore.java
index d95797b8b7..9ffdf45794 100644
--- a/src/main/java/org/opensearch/security/ssl/DefaultSecurityKeyStore.java
+++ b/src/main/java/org/opensearch/security/ssl/DefaultSecurityKeyStore.java
@@ -738,6 +738,7 @@ private String[] getEnabledSSLProtocols(final SslProvider provider, boolean http
 
     }
 
+    @SuppressWarnings("removal")
     private void initEnabledSSLCiphers() {
 
         final List<String> secureHttpSSLCiphers = SSLConfigConstants.getSecureSSLCiphers(settings, true);
@@ -898,6 +899,7 @@ private SslContext buildSSLClientContext(final File _key, final File _cert, fina
 
     }
 
+    @SuppressWarnings("removal")
     private SslContext buildSSLContext0(final SslContextBuilder sslContextBuilder) throws SSLException {
 
         final SecurityManager sm = System.getSecurityManager();
diff --git a/src/main/java/org/opensearch/security/ssl/OpenSearchSecuritySSLPlugin.java b/src/main/java/org/opensearch/security/ssl/OpenSearchSecuritySSLPlugin.java
index 15e93ae177..52983e7814 100644
--- a/src/main/java/org/opensearch/security/ssl/OpenSearchSecuritySSLPlugin.java
+++ b/src/main/java/org/opensearch/security/ssl/OpenSearchSecuritySSLPlugin.java
@@ -109,6 +109,7 @@ public class OpenSearchSecuritySSLPlugin extends Plugin implements SystemIndexPl
 //        this(settings, configPath, false);
 //    }
 
+    @SuppressWarnings("removal")
     protected OpenSearchSecuritySSLPlugin(final Settings settings, final Path configPath, boolean disabled) {
 
         if(disabled) {
diff --git a/src/main/java/org/opensearch/security/ssl/transport/DefaultPrincipalExtractor.java b/src/main/java/org/opensearch/security/ssl/transport/DefaultPrincipalExtractor.java
index fcb721946b..d717df2da6 100644
--- a/src/main/java/org/opensearch/security/ssl/transport/DefaultPrincipalExtractor.java
+++ b/src/main/java/org/opensearch/security/ssl/transport/DefaultPrincipalExtractor.java
@@ -40,6 +40,7 @@ public class DefaultPrincipalExtractor implements PrincipalExtractor {
     protected final Logger log = LogManager.getLogger(this.getClass());
     
     @Override
+    @SuppressWarnings("removal")
     public String extractPrincipal(final X509Certificate x509Certificate, final Type type) {
         if (x509Certificate == null) {
             return null;
diff --git a/src/main/java/org/opensearch/security/ssl/transport/SecuritySSLNettyTransport.java b/src/main/java/org/opensearch/security/ssl/transport/SecuritySSLNettyTransport.java
index 465c5c3a8d..5b452edcad 100644
--- a/src/main/java/org/opensearch/security/ssl/transport/SecuritySSLNettyTransport.java
+++ b/src/main/java/org/opensearch/security/ssl/transport/SecuritySSLNettyTransport.java
@@ -210,6 +210,7 @@ protected class SSLClientChannelInitializer extends Netty4Transport.ClientChanne
         private final DiscoveryNode node;
         private SSLConnectionTestResult connectionTestResult;
 
+        @SuppressWarnings("removal")
         public SSLClientChannelInitializer(DiscoveryNode node) {
             this.node = node;
             hostnameVerificationEnabled = settings.getAsBoolean(
diff --git a/src/main/java/org/opensearch/security/ssl/util/SSLRequestHelper.java b/src/main/java/org/opensearch/security/ssl/util/SSLRequestHelper.java
index 97980b4a44..5bd72fba5d 100644
--- a/src/main/java/org/opensearch/security/ssl/util/SSLRequestHelper.java
+++ b/src/main/java/org/opensearch/security/ssl/util/SSLRequestHelper.java
@@ -102,6 +102,7 @@ public String toString() {
 
     }
 
+    @SuppressWarnings("removal")
     public static SSLInfo getSSLInfo(final Settings settings, final Path configPath, final RestRequest request, PrincipalExtractor principalExtractor) throws SSLPeerUnverifiedException {
         
         if(request == null || request.getHttpChannel() == null || !(request.getHttpChannel() instanceof Netty4HttpChannel)) {
diff --git a/src/main/java/org/opensearch/security/support/Base64Helper.java b/src/main/java/org/opensearch/security/support/Base64Helper.java
index 67aecad164..5f9286a20c 100644
--- a/src/main/java/org/opensearch/security/support/Base64Helper.java
+++ b/src/main/java/org/opensearch/security/support/Base64Helper.java
@@ -107,6 +107,7 @@ private final static class SafeObjectOutputStream extends ObjectOutputStream {
 
         private static final boolean useSafeObjectOutputStream = checkSubstitutionPermission();
 
+        @SuppressWarnings("removal")
         private static boolean checkSubstitutionPermission() {
             SecurityManager sm = System.getSecurityManager();
             if (sm != null) {
@@ -135,6 +136,7 @@ static ObjectOutputStream create(ByteArrayOutputStream out) throws IOException {
             }
         }
 
+        @SuppressWarnings("removal")
         private SafeObjectOutputStream(OutputStream out) throws IOException {
             super(out);
 
diff --git a/src/main/java/org/opensearch/security/support/ReflectiveAttributeAccessors.java b/src/main/java/org/opensearch/security/support/ReflectiveAttributeAccessors.java
index e35b789c9c..dac49334e2 100644
--- a/src/main/java/org/opensearch/security/support/ReflectiveAttributeAccessors.java
+++ b/src/main/java/org/opensearch/security/support/ReflectiveAttributeAccessors.java
@@ -52,6 +52,7 @@ static class ReflectiveAttributeGetter<O, R> implements Function<O, R> {
             this.type = type;
         }
 
+        @SuppressWarnings("removal")
         @Override
         public R apply(O object) {
             final SecurityManager sm = System.getSecurityManager();
@@ -89,6 +90,7 @@ static class ProtectedReflectiveAttributeGetter<O, R> implements Function<O, R>
             this.type = type;
         }
 
+        @SuppressWarnings("removal")
         @Override
         public R apply(O object) {
             final SecurityManager sm = System.getSecurityManager();
@@ -128,6 +130,7 @@ static class ReflectiveAttributeSetter<O, R> implements BiFunction<O, R, Void> {
             this.type = type;
         }
 
+        @SuppressWarnings("removal")
         @Override
         public Void apply(O object, R value) {
             final SecurityManager sm = System.getSecurityManager();
diff --git a/src/main/java/org/opensearch/security/support/SnapshotRestoreHelper.java b/src/main/java/org/opensearch/security/support/SnapshotRestoreHelper.java
index 4a3e0f3e51..9e68e018ef 100644
--- a/src/main/java/org/opensearch/security/support/SnapshotRestoreHelper.java
+++ b/src/main/java/org/opensearch/security/support/SnapshotRestoreHelper.java
@@ -91,6 +91,7 @@ public static SnapshotInfo getSnapshotInfo(RestoreSnapshotRequest restoreRequest
         return snapshotInfo;
     }
     
+    @SuppressWarnings("removal")
     private static void setCurrentThreadName(final String name) {
         final SecurityManager sm = System.getSecurityManager();