diff --git a/client/rest-high-level/src/test/java/org/elasticsearch/client/tasks/ElasticsearchExceptionTests.java b/client/rest-high-level/src/test/java/org/elasticsearch/client/tasks/OpenSearchExceptionTests.java
similarity index 97%
rename from client/rest-high-level/src/test/java/org/elasticsearch/client/tasks/ElasticsearchExceptionTests.java
rename to client/rest-high-level/src/test/java/org/elasticsearch/client/tasks/OpenSearchExceptionTests.java
index 95a88227c52..bcd95507917 100644
--- a/client/rest-high-level/src/test/java/org/elasticsearch/client/tasks/ElasticsearchExceptionTests.java
+++ b/client/rest-high-level/src/test/java/org/elasticsearch/client/tasks/OpenSearchExceptionTests.java
@@ -26,7 +26,7 @@ import org.elasticsearch.common.xcontent.XContentType;
 import java.io.IOException;
 import java.util.Collections;
 
-public class ElasticsearchExceptionTests extends AbstractResponseTestCase<OpenSearchException,
+public class OpenSearchExceptionTests extends AbstractResponseTestCase<OpenSearchException,
     org.elasticsearch.client.tasks.ElasticsearchException> {
 
     @Override
diff --git a/distribution/src/bin/elasticsearch-service.bat b/distribution/src/bin/elasticsearch-service.bat
index 0b9300e9de6..7ba657b28de 100644
--- a/distribution/src/bin/elasticsearch-service.bat
+++ b/distribution/src/bin/elasticsearch-service.bat
@@ -207,7 +207,7 @@ if not "%SERVICE_USERNAME%" == "" (
 		set SERVICE_PARAMS=%SERVICE_PARAMS% --ServiceUser "%SERVICE_USERNAME%" --ServicePassword "%SERVICE_PASSWORD%"
 	)
 )
-"%EXECUTABLE%" //IS//%SERVICE_ID% --Startup %ES_START_TYPE% --StopTimeout %ES_STOP_TIMEOUT% --StartClass org.elasticsearch.bootstrap.Elasticsearch --StartMethod main ++StartParams --quiet --StopClass org.elasticsearch.bootstrap.Elasticsearch --StopMethod close --Classpath "%ES_CLASSPATH%" --JvmMs %JVM_MS% --JvmMx %JVM_MX% --JvmSs %JVM_SS% --JvmOptions %OTHER_JAVA_OPTS% ++JvmOptions %ES_PARAMS% %LOG_OPTS% --PidFile "%SERVICE_ID%.pid" --DisplayName "%SERVICE_DISPLAY_NAME%" --Description "%SERVICE_DESCRIPTION%" --Jvm "%JAVA_HOME%%JVM_DLL%" --StartMode jvm --StopMode jvm --StartPath "%ES_HOME%" %SERVICE_PARAMS% ++Environment HOSTNAME="%%COMPUTERNAME%%"
+"%EXECUTABLE%" //IS//%SERVICE_ID% --Startup %ES_START_TYPE% --StopTimeout %ES_STOP_TIMEOUT% --StartClass org.elasticsearch.bootstrap.OpenSearch --StartMethod main ++StartParams --quiet --StopClass org.elasticsearch.bootstrap.OpenSearch --StopMethod close --Classpath "%ES_CLASSPATH%" --JvmMs %JVM_MS% --JvmMx %JVM_MX% --JvmSs %JVM_SS% --JvmOptions %OTHER_JAVA_OPTS% ++JvmOptions %ES_PARAMS% %LOG_OPTS% --PidFile "%SERVICE_ID%.pid" --DisplayName "%SERVICE_DISPLAY_NAME%" --Description "%SERVICE_DESCRIPTION%" --Jvm "%JAVA_HOME%%JVM_DLL%" --StartMode jvm --StopMode jvm --StartPath "%ES_HOME%" %SERVICE_PARAMS% ++Environment HOSTNAME="%%COMPUTERNAME%%"
 
 if not errorlevel 1 goto installed
 echo Failed installing '%SERVICE_ID%' service
diff --git a/distribution/src/bin/elasticsearch.bat b/distribution/src/bin/elasticsearch.bat
index eff3646445e..61be39687c9 100644
--- a/distribution/src/bin/elasticsearch.bat
+++ b/distribution/src/bin/elasticsearch.bat
@@ -101,7 +101,7 @@ ECHO.!KEYSTORE_PASSWORD!| %JAVA% %ES_JAVA_OPTS% -Delasticsearch ^
   -Des.path.home="%ES_HOME%" -Des.path.conf="%ES_PATH_CONF%" ^
   -Des.distribution.type="%ES_DISTRIBUTION_TYPE%" ^
   -Des.bundled_jdk="%ES_BUNDLED_JDK%" ^
-  -cp "%ES_CLASSPATH%" "org.elasticsearch.bootstrap.Elasticsearch" !newparams!
+  -cp "%ES_CLASSPATH%" "org.elasticsearch.bootstrap.OpenSearch" !newparams!
 
 endlocal
 endlocal
diff --git a/qa/evil-tests/src/test/java/org/opensearch/bootstrap/ESPolicyUnitTests.java b/qa/evil-tests/src/test/java/org/opensearch/bootstrap/OpenSearchPolicyUnitTests.java
similarity index 95%
rename from qa/evil-tests/src/test/java/org/opensearch/bootstrap/ESPolicyUnitTests.java
rename to qa/evil-tests/src/test/java/org/opensearch/bootstrap/OpenSearchPolicyUnitTests.java
index 72250a64fb4..834867ec830 100644
--- a/qa/evil-tests/src/test/java/org/opensearch/bootstrap/ESPolicyUnitTests.java
+++ b/qa/evil-tests/src/test/java/org/opensearch/bootstrap/OpenSearchPolicyUnitTests.java
@@ -37,7 +37,7 @@ import java.util.Collections;
  * Unit tests for ESPolicy: these cannot run with security manager,
  * we don't allow messing with the policy
  */
-public class ESPolicyUnitTests extends OpenSearchTestCase {
+public class OpenSearchPolicyUnitTests extends OpenSearchTestCase {
     /**
      * Test policy with null codesource.
      * <p>
@@ -78,7 +78,7 @@ public class ESPolicyUnitTests extends OpenSearchTestCase {
         final ESPolicy policy = new ESPolicy(Collections.emptyMap(), noPermissions, Collections.emptyMap(), true, new Permissions());
         assertFalse(
             policy.implies(
-                new ProtectionDomain(ESPolicyUnitTests.class.getProtectionDomain().getCodeSource(), noPermissions),
+                new ProtectionDomain(OpenSearchPolicyUnitTests.class.getProtectionDomain().getCodeSource(), noPermissions),
                 new SocketPermission("localhost:" + randomFrom(0, randomIntBetween(49152, 65535)), "listen")));
     }
 
diff --git a/server/src/main/java/org/elasticsearch/bootstrap/Bootstrap.java b/server/src/main/java/org/elasticsearch/bootstrap/Bootstrap.java
index 20169659a81..dba09f4a3df 100644
--- a/server/src/main/java/org/elasticsearch/bootstrap/Bootstrap.java
+++ b/server/src/main/java/org/elasticsearch/bootstrap/Bootstrap.java
@@ -91,7 +91,7 @@ final class Bootstrap {
                     // bail out
                 }
             }
-        }, "elasticsearch[keepAlive/" + Version.CURRENT + "]");
+        }, "opensearch[keepAlive/" + Version.CURRENT + "]");
         keepAliveThread.setDaemon(false);
         // keep this thread alive (non daemon thread) until we shutdown
         Runtime.getRuntime().addShutdownHook(new Thread() {
@@ -108,7 +108,7 @@ final class Bootstrap {
 
         // check if the user is running as root, and bail
         if (Natives.definitelyRunningAsRoot()) {
-            throw new RuntimeException("can not run elasticsearch as root");
+            throw new RuntimeException("can not run opensearch as root");
         }
 
         // enable system call filter
@@ -333,7 +333,7 @@ final class Bootstrap {
     }
 
     /**
-     * This method is invoked by {@link Elasticsearch#main(String[])} to startup elasticsearch.
+     * This method is invoked by {@link OpenSearch#main(String[])} to startup opensearch.
      */
     static void init(
             final boolean foreground,
@@ -358,7 +358,7 @@ final class Bootstrap {
         if (JavaVersion.current().compareTo(JavaVersion.parse("11")) < 0) {
             final String message = String.format(
                             Locale.ROOT,
-                            "future versions of Elasticsearch will require Java 11; " +
+                            "future versions of OpenSearch will require Java 11; " +
                                     "your Java version from [%s] does not meet this requirement",
                             System.getProperty("java.home"));
             DeprecationLogger.getLogger(Bootstrap.class).deprecate("java_version_11_required", message);
@@ -388,7 +388,7 @@ final class Bootstrap {
             // install the default uncaught exception handler; must be done before security is
             // initialized as we do not want to grant the runtime permission
             // setDefaultUncaughtExceptionHandler
-            Thread.setDefaultUncaughtExceptionHandler(new ElasticsearchUncaughtExceptionHandler());
+            Thread.setDefaultUncaughtExceptionHandler(new OpenSearchUncaughtExceptionHandler());
 
             INSTANCE.setup(true, environment);
 
@@ -402,7 +402,7 @@ final class Bootstrap {
             INSTANCE.start();
 
             // We don't close stderr if `--quiet` is passed, because that
-            // hides fatal startup errors. For example, if Elasticsearch is
+            // hides fatal startup errors. For example, if OpenSearch is
             // running via systemd, the init script only specifies
             // `--quiet`, not `-d`, so we want users to be able to see
             // startup errors via journalctl.
@@ -463,7 +463,7 @@ final class Bootstrap {
 
     private static void checkLucene() {
         if (Version.CURRENT.luceneVersion.equals(org.apache.lucene.util.Version.LATEST) == false) {
-            throw new AssertionError("Lucene version mismatch this version of Elasticsearch requires lucene version ["
+            throw new AssertionError("Lucene version mismatch this version of OpenSearch requires lucene version ["
                 + Version.CURRENT.luceneVersion + "]  but the current lucene version is [" + org.apache.lucene.util.Version.LATEST + "]");
         }
     }
diff --git a/server/src/main/java/org/elasticsearch/bootstrap/BootstrapChecks.java b/server/src/main/java/org/elasticsearch/bootstrap/BootstrapChecks.java
index d128c51a4b8..08d89dd8da6 100644
--- a/server/src/main/java/org/elasticsearch/bootstrap/BootstrapChecks.java
+++ b/server/src/main/java/org/elasticsearch/bootstrap/BootstrapChecks.java
@@ -386,7 +386,7 @@ final class BootstrapChecks {
     }
 
     /**
-     * Bootstrap check that the maximum file size is unlimited (otherwise Elasticsearch could run in to an I/O exception writing files).
+     * Bootstrap check that the maximum file size is unlimited (otherwise OpenSearch could run in to an I/O exception writing files).
      */
     static class MaxFileSizeCheck implements BootstrapCheck {
 
@@ -507,7 +507,7 @@ final class BootstrapChecks {
 
     /**
      * Checks if the serial collector is in use. This collector is single-threaded and devastating
-     * for performance and should not be used for a server application like Elasticsearch.
+     * for performance and should not be used for a server application like OpenSearch.
      */
     static class UseSerialGCCheck implements BootstrapCheck {
 
diff --git a/server/src/main/java/org/elasticsearch/bootstrap/JNANatives.java b/server/src/main/java/org/elasticsearch/bootstrap/JNANatives.java
index 232da7e2534..2d9fe1e8515 100644
--- a/server/src/main/java/org/elasticsearch/bootstrap/JNANatives.java
+++ b/server/src/main/java/org/elasticsearch/bootstrap/JNANatives.java
@@ -51,7 +51,7 @@ class JNANatives {
     // otherwise they are only inherited for new threads (ES app threads)
     static boolean LOCAL_SYSTEM_CALL_FILTER_ALL = false;
     // set to the maximum number of threads that can be created for
-    // the user ID that owns the running Elasticsearch process
+    // the user ID that owns the running OpenSearch process
     static long MAX_NUMBER_OF_THREADS = -1;
 
     static long MAX_SIZE_VIRTUAL_MEMORY = Long.MIN_VALUE;
diff --git a/server/src/main/java/org/elasticsearch/bootstrap/Elasticsearch.java b/server/src/main/java/org/elasticsearch/bootstrap/OpenSearch.java
similarity index 85%
rename from server/src/main/java/org/elasticsearch/bootstrap/Elasticsearch.java
rename to server/src/main/java/org/elasticsearch/bootstrap/OpenSearch.java
index 13a3d58c939..687e26a4601 100644
--- a/server/src/main/java/org/elasticsearch/bootstrap/Elasticsearch.java
+++ b/server/src/main/java/org/elasticsearch/bootstrap/OpenSearch.java
@@ -30,8 +30,8 @@ import org.opensearch.cli.Terminal;
 import org.opensearch.cli.UserException;
 import org.elasticsearch.common.logging.LogConfigurator;
 import org.elasticsearch.env.Environment;
-import org.elasticsearch.monitor.jvm.JvmInfo;
-import org.elasticsearch.node.NodeValidationException;
+import org.opensearch.monitor.jvm.JvmInfo;
+import org.opensearch.node.NodeValidationException;
 
 import java.io.IOException;
 import java.nio.file.Path;
@@ -41,9 +41,9 @@ import java.util.Arrays;
 import java.util.Locale;
 
 /**
- * This class starts elasticsearch.
+ * This class starts opensearch.
  */
-class Elasticsearch extends EnvironmentAwareCommand {
+class OpenSearch extends EnvironmentAwareCommand {
 
     private final OptionSpecBuilder versionOption;
     private final OptionSpecBuilder daemonizeOption;
@@ -51,12 +51,12 @@ class Elasticsearch extends EnvironmentAwareCommand {
     private final OptionSpecBuilder quietOption;
 
     // visible for testing
-    Elasticsearch() {
-        super("Starts Elasticsearch", () -> {}); // we configure logging later so we override the base class from configuring logging
+    OpenSearch() {
+        super("Starts OpenSearch", () -> {}); // we configure logging later so we override the base class from configuring logging
         versionOption = parser.acceptsAll(Arrays.asList("V", "version"),
-            "Prints Elasticsearch version information and exits");
+            "Prints OpenSearch version information and exits");
         daemonizeOption = parser.acceptsAll(Arrays.asList("d", "daemonize"),
-            "Starts Elasticsearch in the background")
+            "Starts OpenSearch in the background")
             .availableUnless(versionOption);
         pidfileOption = parser.acceptsAll(Arrays.asList("p", "pidfile"),
             "Creates a pid file in the specified path on start")
@@ -70,7 +70,7 @@ class Elasticsearch extends EnvironmentAwareCommand {
     }
 
     /**
-     * Main entry point for starting elasticsearch
+     * Main entry point for starting opensearch
      */
     public static void main(final String[] args) throws Exception {
         overrideDnsCachePolicyProperties();
@@ -88,18 +88,18 @@ class Elasticsearch extends EnvironmentAwareCommand {
 
         });
         LogConfigurator.registerErrorListener();
-        final Elasticsearch elasticsearch = new Elasticsearch();
-        int status = main(args, elasticsearch, Terminal.DEFAULT);
+        final OpenSearch opensearch = new OpenSearch();
+        int status = main(args, opensearch, Terminal.DEFAULT);
         if (status != ExitCodes.OK) {
-            final String basePath = System.getProperty("es.logs.base_path");
+            final String basePath = System.getProperty("opensearch.logs.base_path");
             // It's possible to fail before logging has been configured, in which case there's no point
             // suggesting that the user look in the log file.
             if (basePath != null) {
                 Terminal.DEFAULT.errorPrintln(
-                    "ERROR: Elasticsearch did not exit normally - check the logs at "
+                    "ERROR: OpenSearch did not exit normally - check the logs at "
                         + basePath
                         + System.getProperty("file.separator")
-                        + System.getProperty("es.logs.cluster_name") + ".log"
+                        + System.getProperty("opensearch.logs.cluster_name") + ".log"
                 );
             }
             exit(status);
@@ -108,7 +108,7 @@ class Elasticsearch extends EnvironmentAwareCommand {
 
     private static void overrideDnsCachePolicyProperties() {
         for (final String property : new String[] {"networkaddress.cache.ttl", "networkaddress.cache.negative.ttl" }) {
-            final String overrideProperty = "es." + property;
+            final String overrideProperty = "opensearch." + property;
             final String overrideValue = System.getProperty(overrideProperty);
             if (overrideValue != null) {
                 try {
@@ -122,8 +122,8 @@ class Elasticsearch extends EnvironmentAwareCommand {
         }
     }
 
-    static int main(final String[] args, final Elasticsearch elasticsearch, final Terminal terminal) throws Exception {
-        return elasticsearch.main(args, terminal);
+    static int main(final String[] args, final OpenSearch opensearch, final Terminal terminal) throws Exception {
+        return opensearch.main(args, terminal);
     }
 
     @Override
@@ -181,7 +181,7 @@ class Elasticsearch extends EnvironmentAwareCommand {
      * http://commons.apache.org/proper/commons-daemon/procrun.html
      *
      * NOTE: If this method is renamed and/or moved, make sure to
-     * update elasticsearch-service.bat!
+     * update opensearch-service.bat!
      */
     static void close(String[] args) throws IOException {
         Bootstrap.stop();
diff --git a/server/src/main/java/org/elasticsearch/bootstrap/ESPolicy.java b/server/src/main/java/org/elasticsearch/bootstrap/OpenSearchPolicy.java
similarity index 96%
rename from server/src/main/java/org/elasticsearch/bootstrap/ESPolicy.java
rename to server/src/main/java/org/elasticsearch/bootstrap/OpenSearchPolicy.java
index 7e4fc79c93d..376be256e47 100644
--- a/server/src/main/java/org/elasticsearch/bootstrap/ESPolicy.java
+++ b/server/src/main/java/org/elasticsearch/bootstrap/OpenSearchPolicy.java
@@ -36,7 +36,7 @@ import java.util.Map;
 import java.util.function.Predicate;
 
 /** custom policy for union of static and dynamic permissions */
-final class ESPolicy extends Policy {
+final class OpenSearchPolicy extends Policy {
 
     /** template policy file, the one used in tests */
     static final String POLICY_RESOURCE = "security.policy";
@@ -50,8 +50,8 @@ final class ESPolicy extends Policy {
     final PermissionCollection dataPathPermission;
     final Map<String,Policy> plugins;
 
-    ESPolicy(Map<String, URL> codebases, PermissionCollection dynamic, Map<String,Policy> plugins, boolean filterBadDefaults,
-             PermissionCollection dataPathPermission) {
+    OpenSearchPolicy(Map<String, URL> codebases, PermissionCollection dynamic, Map<String,Policy> plugins, boolean filterBadDefaults,
+                     PermissionCollection dataPathPermission) {
         this.template = Security.readPolicy(getClass().getResource(POLICY_RESOURCE), codebases);
         this.dataPathPermission = dataPathPermission;
         this.untrusted = Security.readPolicy(getClass().getResource(UNTRUSTED_RESOURCE), Collections.emptyMap());
@@ -102,7 +102,7 @@ final class ESPolicy extends Policy {
         }
 
         // The FilePermission to check access to the path.data is the hottest permission check in
-        // Elasticsearch, so we check it first.
+        // OpenSearch, so we check it first.
         if (permission instanceof FilePermission && dataPathPermission.implies(permission)) {
             return true;
         }
diff --git a/server/src/main/java/org/elasticsearch/bootstrap/ElasticsearchUncaughtExceptionHandler.java b/server/src/main/java/org/elasticsearch/bootstrap/OpenSearchUncaughtExceptionHandler.java
similarity index 94%
rename from server/src/main/java/org/elasticsearch/bootstrap/ElasticsearchUncaughtExceptionHandler.java
rename to server/src/main/java/org/elasticsearch/bootstrap/OpenSearchUncaughtExceptionHandler.java
index 9f2d2a8c6bf..5f788fccd7a 100644
--- a/server/src/main/java/org/elasticsearch/bootstrap/ElasticsearchUncaughtExceptionHandler.java
+++ b/server/src/main/java/org/elasticsearch/bootstrap/OpenSearchUncaughtExceptionHandler.java
@@ -28,8 +28,8 @@ import java.io.IOError;
 import java.security.AccessController;
 import java.security.PrivilegedAction;
 
-class ElasticsearchUncaughtExceptionHandler implements Thread.UncaughtExceptionHandler {
-    private static final Logger logger = LogManager.getLogger(ElasticsearchUncaughtExceptionHandler.class);
+class OpenSearchUncaughtExceptionHandler implements Thread.UncaughtExceptionHandler {
+    private static final Logger logger = LogManager.getLogger(OpenSearchUncaughtExceptionHandler.class);
 
     @Override
     public void uncaughtException(Thread thread, Throwable t) {
diff --git a/server/src/main/java/org/elasticsearch/bootstrap/Security.java b/server/src/main/java/org/elasticsearch/bootstrap/Security.java
index 48739d4dc50..2f5634bad33 100644
--- a/server/src/main/java/org/elasticsearch/bootstrap/Security.java
+++ b/server/src/main/java/org/elasticsearch/bootstrap/Security.java
@@ -118,14 +118,14 @@ final class Security {
 
         // enable security policy: union of template and environment-based paths, and possibly plugin permissions
         Map<String, URL> codebases = getCodebaseJarMap(JarHell.parseClassPath());
-        Policy.setPolicy(new ESPolicy(codebases, createPermissions(environment), getPluginPermissions(environment), filterBadDefaults,
+        Policy.setPolicy(new OpenSearchPolicy(codebases, createPermissions(environment), getPluginPermissions(environment), filterBadDefaults,
             createRecursiveDataPathPermission(environment)));
 
         // enable security manager
         final String[] classesThatCanExit =
                 new String[]{
                         // SecureSM matches class names as regular expressions so we escape the $ that arises from the nested class name
-                        ElasticsearchUncaughtExceptionHandler.PrivilegedHaltAction.class.getName().replace("$", "\\$"),
+                        OpenSearchUncaughtExceptionHandler.PrivilegedHaltAction.class.getName().replace("$", "\\$"),
                         Command.class.getName()};
         System.setSecurityManager(new SecureSM(classesThatCanExit));
 
diff --git a/server/src/test/java/org/elasticsearch/cluster/coordination/ElasticsearchNodeCommandTests.java b/server/src/test/java/org/elasticsearch/cluster/coordination/OpenSearchNodeCommandTests.java
similarity index 98%
rename from server/src/test/java/org/elasticsearch/cluster/coordination/ElasticsearchNodeCommandTests.java
rename to server/src/test/java/org/elasticsearch/cluster/coordination/OpenSearchNodeCommandTests.java
index 9848ddf9ece..665b651efd1 100644
--- a/server/src/test/java/org/elasticsearch/cluster/coordination/ElasticsearchNodeCommandTests.java
+++ b/server/src/test/java/org/elasticsearch/cluster/coordination/OpenSearchNodeCommandTests.java
@@ -48,7 +48,7 @@ import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.instanceOf;
 import static org.hamcrest.Matchers.not;
 
-public class ElasticsearchNodeCommandTests extends ESTestCase {
+public class OpenSearchNodeCommandTests extends ESTestCase {
 
     public void testLoadStateWithoutMissingCustoms() throws IOException {
         runLoadStateTest(false, false);
diff --git a/server/src/test/java/org/opensearch/rest/BytesRestResponseTests.java b/server/src/test/java/org/opensearch/rest/BytesRestResponseTests.java
index 0af39bedf86..ea660b96a24 100644
--- a/server/src/test/java/org/opensearch/rest/BytesRestResponseTests.java
+++ b/server/src/test/java/org/opensearch/rest/BytesRestResponseTests.java
@@ -44,7 +44,7 @@ import java.io.IOException;
 import java.util.Collections;
 import java.util.Map;
 
-import static org.elasticsearch.ElasticsearchExceptionTests.assertDeepEquals;
+import static org.opensearch.OpenSearchExceptionTests.assertDeepEquals;
 import static org.hamcrest.Matchers.contains;
 import static org.hamcrest.Matchers.containsString;
 import static org.hamcrest.Matchers.not;
diff --git a/test/framework/src/main/java/org/elasticsearch/bootstrap/BootstrapForTesting.java b/test/framework/src/main/java/org/elasticsearch/bootstrap/BootstrapForTesting.java
index 05f553afa7b..a514157ab68 100644
--- a/test/framework/src/main/java/org/elasticsearch/bootstrap/BootstrapForTesting.java
+++ b/test/framework/src/main/java/org/elasticsearch/bootstrap/BootstrapForTesting.java
@@ -139,22 +139,22 @@ public class BootstrapForTesting {
 
                 // read test-framework permissions
                 Map<String, URL> codebases = Security.getCodebaseJarMap(JarHell.parseClassPath());
-                // when testing server, the main elasticsearch code is not yet in a jar, so we need to manually add it
-                addClassCodebase(codebases,"elasticsearch", "org.elasticsearch.plugins.PluginsService");
+                // when testing server, the main opensearch code is not yet in a jar, so we need to manually add it
+                addClassCodebase(codebases,"opensearch", "org.elasticsearch.plugins.PluginsService");
                 if (System.getProperty("tests.gradle") == null) {
                     // intellij and eclipse don't package our internal libs, so we need to set the codebases for them manually
                     addClassCodebase(codebases,"plugin-classloader", "org.elasticsearch.plugins.ExtendedPluginsClassLoader");
-                    addClassCodebase(codebases,"elasticsearch-nio", "org.elasticsearch.nio.ChannelFactory");
-                    addClassCodebase(codebases, "elasticsearch-secure-sm", "org.elasticsearch.secure_sm.SecureSM");
-                    addClassCodebase(codebases, "elasticsearch-rest-client", "org.elasticsearch.client.RestClient");
+                    addClassCodebase(codebases,"opensearch-nio", "org.elasticsearch.nio.ChannelFactory");
+                    addClassCodebase(codebases, "opensearch-secure-sm", "org.elasticsearch.secure_sm.SecureSM");
+                    addClassCodebase(codebases, "opensearch-rest-client", "org.elasticsearch.client.RestClient");
                 }
                 final Policy testFramework = Security.readPolicy(Bootstrap.class.getResource("test-framework.policy"), codebases);
-                final Policy esPolicy = new ESPolicy(codebases, perms, getPluginPermissions(), true, new Permissions());
+                final Policy opensearchPolicy = new OpenSearchPolicy(codebases, perms, getPluginPermissions(), true, new Permissions());
                 Policy.setPolicy(new Policy() {
                     @Override
                     public boolean implies(ProtectionDomain domain, Permission permission) {
                         // implements union
-                        return esPolicy.implies(domain, permission) || testFramework.implies(domain, permission);
+                        return opensearchPolicy.implies(domain, permission) || testFramework.implies(domain, permission);
                     }
                 });
                 System.setSecurityManager(SecureSM.createTestSecureSM());
diff --git a/test/framework/src/test/java/org/elasticsearch/test/hamcrest/ElasticsearchAssertionsTests.java b/test/framework/src/test/java/org/elasticsearch/test/hamcrest/OpenSearchAssertionsTests.java
similarity index 99%
rename from test/framework/src/test/java/org/elasticsearch/test/hamcrest/ElasticsearchAssertionsTests.java
rename to test/framework/src/test/java/org/elasticsearch/test/hamcrest/OpenSearchAssertionsTests.java
index 7dc3fd9e532..6d4deef58f1 100644
--- a/test/framework/src/test/java/org/elasticsearch/test/hamcrest/ElasticsearchAssertionsTests.java
+++ b/test/framework/src/test/java/org/elasticsearch/test/hamcrest/OpenSearchAssertionsTests.java
@@ -43,7 +43,7 @@ import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertBloc
 import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertToXContentEquivalent;
 import static org.hamcrest.Matchers.containsString;
 
-public class ElasticsearchAssertionsTests extends ESTestCase {
+public class OpenSearchAssertionsTests extends ESTestCase {
 
     public void testAssertXContentEquivalent() throws IOException {
         try (XContentBuilder original = JsonXContent.contentBuilder()) {