[Rename] Second pass clean up of imports and variable names in server module (#382)

This commit cleans up imports, variable names, comments, and other misc usages
of ES with the new OpenSearch name.

Signed-off-by: Nicholas Walter Knize <nknize@apache.org>

modules/reindex/src/test/java/org/opensearch/index/reindex/remote/RemoteScrollableHitSourceTests.java

@@ -256,8 +256,8 @@ public class RemoteScrollableHitSourceTests extends OpenSearchTestCase {
             assertEquals("87A7NvevQxSrEwMbtRCecg", r.getFailures().get(0).getNodeId());
             assertThat(r.getFailures().get(0).getReason(), instanceOf(OpenSearchRejectedExecutionException.class));
             assertEquals("rejected execution of org.opensearch.transport.TransportService$5@52d06af2 on "
-                    + "EsThreadPoolExecutor[search, queue capacity = 1000, org.opensearch.common.util.concurrent."
+                    + "OpenSearchThreadPoolExecutor[search, queue capacity = 1000, org.opensearch.common.util.concurrent."
-                    + "EsThreadPoolExecutor@778ea553[Running, pool size = 7, active threads = 7, queued tasks = 1000, "
+                    + "OpenSearchThreadPoolExecutor@778ea553[Running, pool size = 7, active threads = 7, queued tasks = 1000, "
                     + "completed tasks = 4182]]", r.getFailures().get(0).getReason().getMessage());
             assertThat(r.getHits(), hasSize(1));
             assertEquals("test", r.getHits().get(0).getIndex());

qa/evil-tests/src/test/java/org/opensearch/threadpool/EvilThreadPoolTests.java

@@ -23,8 +23,8 @@ import org.opensearch.common.settings.Settings;
 import org.opensearch.common.unit.TimeValue;
 import org.opensearch.common.util.concurrent.AbstractRunnable;
 import org.opensearch.common.util.concurrent.OpenSearchExecutors;
-import org.opensearch.common.util.concurrent.EsThreadPoolExecutor;
+import org.opensearch.common.util.concurrent.OpenSearchThreadPoolExecutor;
-import org.opensearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor;
+import org.opensearch.common.util.concurrent.PrioritizedOpenSearchThreadPoolExecutor;
 import org.opensearch.test.OpenSearchTestCase;
 import org.junit.After;
 import org.junit.Before;
@@ -70,7 +70,7 @@ public class EvilThreadPoolTests extends OpenSearchTestCase {
     }
 
     public void testExecutionErrorOnFixedESThreadPoolExecutor() throws InterruptedException {
-        final EsThreadPoolExecutor fixedExecutor = OpenSearchExecutors.newFixed("test", 1, 1,
+        final OpenSearchThreadPoolExecutor fixedExecutor = OpenSearchExecutors.newFixed("test", 1, 1,
             OpenSearchExecutors.daemonThreadFactory("test"), threadPool.getThreadContext());
         try {
             checkExecutionError(getExecuteRunner(fixedExecutor));
@@ -81,7 +81,7 @@ public class EvilThreadPoolTests extends OpenSearchTestCase {
     }
 
     public void testExecutionErrorOnScalingESThreadPoolExecutor() throws InterruptedException {
-        final EsThreadPoolExecutor scalingExecutor = OpenSearchExecutors.newScaling("test", 1, 1,
+        final OpenSearchThreadPoolExecutor scalingExecutor = OpenSearchExecutors.newScaling("test", 1, 1,
             10, TimeUnit.SECONDS, OpenSearchExecutors.daemonThreadFactory("test"), threadPool.getThreadContext());
         try {
             checkExecutionError(getExecuteRunner(scalingExecutor));
@@ -92,7 +92,7 @@ public class EvilThreadPoolTests extends OpenSearchTestCase {
     }
 
     public void testExecutionErrorOnAutoQueueFixedESThreadPoolExecutor() throws InterruptedException {
-        final EsThreadPoolExecutor autoQueueFixedExecutor = OpenSearchExecutors.newAutoQueueFixed("test", 1, 1,
+        final OpenSearchThreadPoolExecutor autoQueueFixedExecutor = OpenSearchExecutors.newAutoQueueFixed("test", 1, 1,
             1, 1, 1, TimeValue.timeValueSeconds(10), OpenSearchExecutors.daemonThreadFactory("test"), threadPool.getThreadContext());
         try {
             checkExecutionError(getExecuteRunner(autoQueueFixedExecutor));
@@ -103,7 +103,7 @@ public class EvilThreadPoolTests extends OpenSearchTestCase {
     }
 
     public void testExecutionErrorOnSinglePrioritizingThreadPoolExecutor() throws InterruptedException {
-        final PrioritizedEsThreadPoolExecutor prioritizedExecutor = OpenSearchExecutors.newSinglePrioritizing("test",
+        final PrioritizedOpenSearchThreadPoolExecutor prioritizedExecutor = OpenSearchExecutors.newSinglePrioritizing("test",
             OpenSearchExecutors.daemonThreadFactory("test"), threadPool.getThreadContext(), threadPool.scheduler());
         try {
             checkExecutionError(getExecuteRunner(prioritizedExecutor));
@@ -179,7 +179,7 @@ public class EvilThreadPoolTests extends OpenSearchTestCase {
     }
 
     public void testExecutionExceptionOnFixedESThreadPoolExecutor() throws InterruptedException {
-        final EsThreadPoolExecutor fixedExecutor = OpenSearchExecutors.newFixed("test", 1, 1,
+        final OpenSearchThreadPoolExecutor fixedExecutor = OpenSearchExecutors.newFixed("test", 1, 1,
             OpenSearchExecutors.daemonThreadFactory("test"), threadPool.getThreadContext());
         try {
             checkExecutionException(getExecuteRunner(fixedExecutor), true);
@@ -190,7 +190,7 @@ public class EvilThreadPoolTests extends OpenSearchTestCase {
     }
 
     public void testExecutionExceptionOnScalingESThreadPoolExecutor() throws InterruptedException {
-        final EsThreadPoolExecutor scalingExecutor = OpenSearchExecutors.newScaling("test", 1, 1,
+        final OpenSearchThreadPoolExecutor scalingExecutor = OpenSearchExecutors.newScaling("test", 1, 1,
             10, TimeUnit.SECONDS, OpenSearchExecutors.daemonThreadFactory("test"), threadPool.getThreadContext());
         try {
             checkExecutionException(getExecuteRunner(scalingExecutor), true);
@@ -201,7 +201,7 @@ public class EvilThreadPoolTests extends OpenSearchTestCase {
     }
 
     public void testExecutionExceptionOnAutoQueueFixedESThreadPoolExecutor() throws InterruptedException {
-        final EsThreadPoolExecutor autoQueueFixedExecutor = OpenSearchExecutors.newAutoQueueFixed("test", 1, 1,
+        final OpenSearchThreadPoolExecutor autoQueueFixedExecutor = OpenSearchExecutors.newAutoQueueFixed("test", 1, 1,
             1, 1, 1, TimeValue.timeValueSeconds(10), OpenSearchExecutors.daemonThreadFactory("test"), threadPool.getThreadContext());
         try {
             // fixed_auto_queue_size wraps stuff into TimedRunnable, which is an AbstractRunnable
@@ -213,7 +213,7 @@ public class EvilThreadPoolTests extends OpenSearchTestCase {
     }
 
     public void testExecutionExceptionOnSinglePrioritizingThreadPoolExecutor() throws InterruptedException {
-        final PrioritizedEsThreadPoolExecutor prioritizedExecutor = OpenSearchExecutors.newSinglePrioritizing("test",
+        final PrioritizedOpenSearchThreadPoolExecutor prioritizedExecutor = OpenSearchExecutors.newSinglePrioritizing("test",
             OpenSearchExecutors.daemonThreadFactory("test"), threadPool.getThreadContext(), threadPool.scheduler());
         try {
             checkExecutionException(getExecuteRunner(prioritizedExecutor), true);

qa/os/src/test/java/org/opensearch/packaging/util/Packages.java

@@ -236,7 +236,7 @@ public class Packages {
         return sh.runIgnoreExitCode("service opensearch start");
     }
 
-    public static void assertElasticsearchStarted(Shell sh, Installation installation) throws Exception {
+    public static void assertOpenSearchearchStarted(Shell sh, Installation installation) throws Exception {
         waitForOpenSearch(installation);
 
         if (isSystemd()) {
@@ -261,7 +261,7 @@ public class Packages {
         } else {
             sh.run("service opensearch restart");
         }
-        assertElasticsearchStarted(sh, installation);
+        assertOpenSearchearchStarted(sh, installation);
     }
 
     /**

server/src/main/java/org/apache/lucene/search/vectorhighlight/CustomFieldQuery.java

@@ -32,7 +32,7 @@ import org.apache.lucene.search.TermQuery;
 import org.apache.lucene.search.spans.SpanTermQuery;
 import org.opensearch.common.lucene.search.MultiPhrasePrefixQuery;
 import org.opensearch.common.lucene.search.function.FunctionScoreQuery;
-import org.opensearch.index.search.ESToParentBlockJoinQuery;
+import org.opensearch.index.search.OpenSearchToParentBlockJoinQuery;
 
 import java.io.IOException;
 import java.util.Collection;
@@ -85,8 +85,8 @@ public class CustomFieldQuery extends FieldQuery {
             for (Term term : synQuery.getTerms()) {
                 flatten(new TermQuery(term), reader, flatQueries, boost);
             }
-        } else if (sourceQuery instanceof ESToParentBlockJoinQuery) {
+        } else if (sourceQuery instanceof OpenSearchToParentBlockJoinQuery) {
-            Query childQuery = ((ESToParentBlockJoinQuery) sourceQuery).getChildQuery();
+            Query childQuery = ((OpenSearchToParentBlockJoinQuery) sourceQuery).getChildQuery();
             if (childQuery != null) {
                 flatten(childQuery, reader, flatQueries, boost);
             }

server/src/main/java/org/opensearch/Build.java

@@ -95,12 +95,12 @@ public class Build {
         // these are parsed at startup, and we require that we are able to recognize the values passed in by the startup scripts
         type = Type.fromDisplayName(System.getProperty("es.distribution.type", "unknown"), true);
 
-        final String esPrefix = "elasticsearch-" + Version.CURRENT;
+        final String opensearchPrefix = "opensearch-" + Version.CURRENT;
         final URL url = getOpenSearchCodeSourceLocation();
         final String urlStr = url == null ? "" : url.toString();
         if (urlStr.startsWith("file:/") && (
-            urlStr.endsWith(esPrefix + ".jar") ||
+            urlStr.endsWith(opensearchPrefix + ".jar") ||
-            urlStr.matches("(.*)" + esPrefix + "(-)?((alpha|beta|rc)[0-9]+)?(-SNAPSHOT)?.jar")
+            urlStr.matches("(.*)" + opensearchPrefix + "(-)?((alpha|beta|rc)[0-9]+)?(-SNAPSHOT)?.jar")
         )) {
             try (JarInputStream jar = new JarInputStream(FileSystemUtils.openFileURLStream(url))) {
                 Manifest manifest = jar.getManifest();
@@ -112,7 +112,7 @@ public class Build {
                 throw new RuntimeException(e);
             }
         } else {
-            // not running from the official elasticsearch jar file (unit tests, IDE, uber client jar, shadiness)
+            // not running from the official opensearch jar file (unit tests, IDE, uber client jar, shadiness)
             hash = "unknown";
             date = "unknown";
             version = Version.CURRENT.toString();

server/src/main/java/org/opensearch/Version.java

@@ -545,7 +545,7 @@ public class Version implements Comparable<Version>, ToXContentFragment {
 
     /**
      * Returns true iff this version is an alpha version
-     * Note: This has been introduced in elasticsearch version 5. Previous versions will never
+     * Note: This has been introduced in version 5 of the OpenSearch predecessor. Previous versions will never
      * have an alpha version.
      */
     public boolean isAlpha() {

server/src/main/java/org/opensearch/action/admin/cluster/node/info/NodeInfo.java

@@ -117,7 +117,7 @@ public class NodeInfo extends BaseNodeResponse {
     }
 
     /**
-     * The current ES version
+     * The current OpenSearch version
      */
     public Version getVersion() {
         return version;

server/src/main/java/org/opensearch/action/admin/indices/upgrade/post/UpgradeSettingsRequest.java

@@ -49,7 +49,7 @@ public class UpgradeSettingsRequest extends AcknowledgedRequest<UpgradeSettingsR
     /**
      * Constructs a new request to update minimum compatible version settings for one or more indices
      *
-     * @param versions a map from index name to elasticsearch version, oldest lucene segment version tuple
+     * @param versions a map from index name to opensearch version, oldest lucene segment version tuple
      */
     public UpgradeSettingsRequest(Map<String, Tuple<Version, String>> versions) {
         this.versions = versions;

server/src/main/java/org/opensearch/action/get/GetResponse.java

@@ -182,7 +182,7 @@ public class GetResponse extends ActionResponse implements Iterable<DocumentFiel
      * doesn't know. But before returning the result it will check that enough information were
      * parsed to return a valid {@link GetResponse} instance and throws a {@link ParsingException}
      * otherwise. This is the case when we get a 404 back, which can be parsed as a normal
-     * {@link GetResponse} with found set to false, or as an elasticsearch exception. The caller
+     * {@link GetResponse} with found set to false, or as an opensearch exception. The caller
      * of this method needs a way to figure out whether we got back a valid get response, which
      * can be done by catching ParsingException.
      *

server/src/main/java/org/opensearch/bootstrap/Bootstrap.java

@@ -309,7 +309,7 @@ final class Bootstrap {
             builder.setSecureSettings(secureSettings);
         }
         return InternalSettingsPreparer.prepareEnvironment(builder.build(), Collections.emptyMap(), configPath,
-                // HOSTNAME is set by elasticsearch-env and elasticsearch-env.bat so it is always available
+                // HOSTNAME is set by opensearch-env and opensearch-env.bat so it is always available
                 () -> System.getenv("HOSTNAME"));
     }
 

server/src/main/java/org/opensearch/bootstrap/BootstrapChecks.java

@@ -296,7 +296,7 @@ final class BootstrapChecks {
             if (maxFileDescriptorCount != -1 && maxFileDescriptorCount < limit) {
                 final String message = String.format(
                         Locale.ROOT,
-                        "max file descriptors [%d] for elasticsearch process is too low, increase to at least [%d]",
+                        "max file descriptors [%d] for opensearch process is too low, increase to at least [%d]",
                         getMaxFileDescriptorCount(),
                         limit);
                 return BootstrapCheckResult.failure(message);
@@ -317,7 +317,7 @@ final class BootstrapChecks {
         @Override
         public BootstrapCheckResult check(BootstrapContext context) {
             if (BootstrapSettings.MEMORY_LOCK_SETTING.get(context.settings()) && !isMemoryLocked()) {
-                return BootstrapCheckResult.failure("memory locking requested for elasticsearch process but memory is not locked");
+                return BootstrapCheckResult.failure("memory locking requested for opensearch process but memory is not locked");
             } else {
                 return BootstrapCheckResult.success();
             }

server/src/main/java/org/opensearch/bootstrap/JNANatives.java

@@ -48,7 +48,7 @@ class JNANatives {
     // Set to true, in case native system call filter install was successful
     static boolean LOCAL_SYSTEM_CALL_FILTER = false;
     // Set to true, in case policy can be applied to all threads of the process (even existing ones)
-    // otherwise they are only inherited for new threads (ES app threads)
+    // otherwise they are only inherited for new threads (OpenSearch 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 OpenSearch process

server/src/main/java/org/opensearch/bootstrap/OpenSearchUncaughtExceptionHandler.java

@@ -67,7 +67,7 @@ class OpenSearchUncaughtExceptionHandler implements Thread.UncaughtExceptionHand
         logger.error(message, t);
         Terminal.DEFAULT.errorPrintln(message);
         t.printStackTrace(Terminal.DEFAULT.getErrorWriter());
-        // Without a final flush, the stacktrace may not be shown before ES exits
+        // Without a final flush, the stacktrace may not be shown before OpenSearch exits
         Terminal.DEFAULT.flush();
     }
 
@@ -76,7 +76,7 @@ class OpenSearchUncaughtExceptionHandler implements Thread.UncaughtExceptionHand
         logger.error(message, t);
         Terminal.DEFAULT.errorPrintln(message);
         t.printStackTrace(Terminal.DEFAULT.getErrorWriter());
-        // Without a final flush, the stacktrace may not be shown if ES goes on to exit
+        // Without a final flush, the stacktrace may not be shown if OpenSearch goes on to exit
         Terminal.DEFAULT.flush();
     }
 

server/src/main/java/org/opensearch/bootstrap/Security.java

@@ -66,7 +66,7 @@ import static org.opensearch.bootstrap.FilePermissionUtils.addSingleFilePath;
  * between security and ease of use:
  * <ul>
  *   <li>Assigns file permissions to user-configurable paths that can
- *       be specified from the command-line or {@code elasticsearch.yml}.</li>
+ *       be specified from the command-line or {@code opensearch.yml}.</li>
  *   <li>Allows for some contained usage of native code that would not
  *       otherwise be permitted.</li>
  * </ul>
@@ -85,7 +85,7 @@ import static org.opensearch.bootstrap.FilePermissionUtils.addSingleFilePath;
  * permission, but there are extenuating circumstances.
  * <p>
  * Scripts (groovy) are assigned minimal permissions. This does not provide adequate
- * sandboxing, as these scripts still have access to ES classes, and could
+ * sandboxing, as these scripts still have access to OpenSearch classes, and could
  * modify members, etc that would cause bad things to happen later on their
  * behalf (no package protections are yet in place, this would need some
  * cleanups to the scripting apis). But still it can provide some defense for users
@@ -94,7 +94,7 @@ import static org.opensearch.bootstrap.FilePermissionUtils.addSingleFilePath;
  * <h2>Debugging Security</h2>
  * A good place to start when there is a problem is to turn on security debugging:
  * <pre>
- * ES_JAVA_OPTS="-Djava.security.debug=access,failure" bin/elasticsearch
+ * ES_JAVA_OPTS="-Djava.security.debug=access,failure" bin/opensearch
  * </pre>
  * <p>
  * When running tests you have to pass it to the test runner like this:
@@ -134,7 +134,7 @@ final class Security {
     }
 
     /**
-     * Return a map from codebase name to codebase url of jar codebases used by ES core.
+     * Return a map from codebase name to codebase url of jar codebases used by OpenSearch core.
      */
     @SuppressForbidden(reason = "find URL path")
     static Map<String, URL> getCodebaseJarMap(Set<URL> urls) {

server/src/main/java/org/opensearch/bootstrap/SystemCallFilter.java

@@ -54,7 +54,7 @@ import java.util.Map;
  * On Linux BPF Filters are installed using either {@code seccomp(2)} (3.17+) or {@code prctl(2)} (3.5+). {@code seccomp(2)}
  * is preferred, as it allows filters to be applied to any existing threads in the process, and one motivation
  * here is to protect against bugs in the JVM. Otherwise, code will fall back to the {@code prctl(2)} method
- * which will at least protect elasticsearch application threads.
+ * which will at least protect opensearch application threads.
  * <p>
  * Linux BPF filters will return {@code EACCES} (Access Denied) for the following system calls:
  * <ul>
@@ -128,7 +128,7 @@ final class SystemCallFilter {
     static final int SECCOMP_SET_MODE_FILTER   =   1;   // since Linux 3.17
     static final int SECCOMP_FILTER_FLAG_TSYNC =   1;   // since Linux 3.17
 
-    /** otherwise, we can use prctl(2), which will at least protect ES application threads */
+    /** otherwise, we can use prctl(2), which will at least protect OpenSearch application threads */
     static final int PR_GET_NO_NEW_PRIVS       =  39;   // since Linux 3.5
     static final int PR_SET_NO_NEW_PRIVS       =  38;   // since Linux 3.5
     static final int PR_GET_SECCOMP            =  21;   // since Linux 2.6.23

server/src/main/java/org/opensearch/cli/EnvironmentAwareCommand.java

@@ -99,7 +99,7 @@ public abstract class EnvironmentAwareCommand extends Command {
         }
         return InternalSettingsPreparer.prepareEnvironment(baseSettings, settings,
             getConfigPath(esPathConf),
-            // HOSTNAME is set by elasticsearch-env and elasticsearch-env.bat so it is always available
+            // HOSTNAME is set by opensearch-env and opensearch-env.bat so it is always available
             () -> System.getenv("HOSTNAME"));
     }
 

server/src/main/java/org/opensearch/cli/KeyStoreAwareCommand.java

@@ -29,7 +29,7 @@ import java.security.GeneralSecurityException;
 import java.util.Arrays;
 
 /**
- * An {@link org.opensearch.cli.EnvironmentAwareCommand} that needs to access the elasticsearch keystore, possibly
+ * An {@link org.opensearch.cli.EnvironmentAwareCommand} that needs to access the opensearch keystore, possibly
  * decrypting it if it is password protected.
  */
 public abstract class KeyStoreAwareCommand extends EnvironmentAwareCommand {
@@ -52,7 +52,7 @@ public abstract class KeyStoreAwareCommand extends EnvironmentAwareCommand {
     protected static SecureString readPassword(Terminal terminal, boolean withVerification) throws UserException {
         final char[] passwordArray;
         if (withVerification) {
-            passwordArray = terminal.readSecret("Enter new password for the elasticsearch keystore (empty for no password): ",
+            passwordArray = terminal.readSecret("Enter new password for the opensearch keystore (empty for no password): ",
                 MAX_PASSPHRASE_LENGTH);
             char[] passwordVerification = terminal.readSecret("Enter same password again: ",
                 MAX_PASSPHRASE_LENGTH);
@@ -61,7 +61,7 @@ public abstract class KeyStoreAwareCommand extends EnvironmentAwareCommand {
             }
             Arrays.fill(passwordVerification, '\u0000');
         } else {
-            passwordArray = terminal.readSecret("Enter password for the elasticsearch keystore : ");
+            passwordArray = terminal.readSecret("Enter password for the opensearch keystore : ");
         }
         return new SecureString(passwordArray);
     }

server/src/main/java/org/opensearch/cluster/ClusterName.java

@@ -31,7 +31,7 @@ import java.util.function.Predicate;
 
 public class ClusterName implements Writeable {
 
-    public static final Setting<ClusterName> CLUSTER_NAME_SETTING = new Setting<>("cluster.name", "elasticsearch", (s) -> {
+    public static final Setting<ClusterName> CLUSTER_NAME_SETTING = new Setting<>("cluster.name", "opensearch", (s) -> {
         if (s.isEmpty()) {
             throw new IllegalArgumentException("[cluster.name] must not be empty");
         }

server/src/main/java/org/opensearch/cluster/coordination/DetachClusterCommand.java

@@ -37,7 +37,7 @@ public class DetachClusterCommand extends OpenSearchNodeCommand {
             "You should only run this tool if you have permanently lost all of the\n" +
             "master-eligible nodes in this cluster and you cannot restore the cluster\n" +
             "from a snapshot, or you have already unsafely bootstrapped a new cluster\n" +
-            "by running `elasticsearch-node unsafe-bootstrap` on a master-eligible\n" +
+            "by running `opensearch-node unsafe-bootstrap` on a master-eligible\n" +
             "node that belonged to the same cluster as this node. This tool can cause\n" +
             "arbitrary data loss and its use should be your last resort.\n" +
             "\n" +

server/src/main/java/org/opensearch/cluster/coordination/JoinTaskExecutor.java

@@ -261,7 +261,7 @@ public class JoinTaskExecutor implements ClusterStateTaskExecutor<JoinTaskExecut
 
     /**
      * Ensures that all indices are compatible with the given node version. This will ensure that all indices in the given metadata
-     * will not be created with a newer version of elasticsearch as well as that all indices are newer or equal to the minimum index
+     * will not be created with a newer version of opensearch as well as that all indices are newer or equal to the minimum index
      * compatibility version.
      * @see Version#minimumIndexCompatibilityVersion()
      * @throws IllegalStateException if any index is incompatible with the given version

server/src/main/java/org/opensearch/cluster/metadata/MetadataIndexUpgradeService.java

@@ -108,9 +108,9 @@ public class MetadataIndexUpgradeService {
     }
 
     /**
-     * Elasticsearch v6.0 no longer supports indices created pre v5.0. All indices
+     * The OpenSearch predecessor, Elasticsearch, v6.0 no longer supports indices created pre v5.0. All indices
      * that were created before Elasticsearch v5.0 should be re-indexed in Elasticsearch 5.x
-     * before they can be opened by this version of elasticsearch.
+     * before they can be opened by this version of opensearch.
      */
     private void checkSupportedVersion(IndexMetadata indexMetadata, Version minimumIndexCompatibilityVersion) {
         if (indexMetadata.getState() == IndexMetadata.State.OPEN && isSupportedVersion(indexMetadata,
@@ -124,7 +124,7 @@ public class MetadataIndexUpgradeService {
     }
 
     /*
-     * Returns true if this index can be supported by the current version of elasticsearch
+     * Returns true if this index can be supported by the current version of opensearch
      */
     private static boolean isSupportedVersion(IndexMetadata indexMetadata, Version minimumIndexCompatibilityVersion) {
         return indexMetadata.getCreationVersion().onOrAfter(minimumIndexCompatibilityVersion);

server/src/main/java/org/opensearch/cluster/node/DiscoveryNode.java

@@ -115,7 +115,7 @@ public class DiscoveryNode implements Writeable, ToXContentFragment {
      * Creates a new {@link DiscoveryNode}
      * <p>
      * <b>Note:</b> if the version of the node is unknown {@link Version#minimumCompatibilityVersion()} should be used for the current
-     * version. it corresponds to the minimum version this elasticsearch version can communicate with. If a higher version is used
+     * version. it corresponds to the minimum version this opensearch version can communicate with. If a higher version is used
      * the node might not be able to communicate with the remote node. After initial handshakes node versions will be discovered
      * and updated.
      * </p>
@@ -132,7 +132,7 @@ public class DiscoveryNode implements Writeable, ToXContentFragment {
      * Creates a new {@link DiscoveryNode}
      * <p>
      * <b>Note:</b> if the version of the node is unknown {@link Version#minimumCompatibilityVersion()} should be used for the current
-     * version. it corresponds to the minimum version this elasticsearch version can communicate with. If a higher version is used
+     * version. it corresponds to the minimum version this opensearch version can communicate with. If a higher version is used
      * the node might not be able to communicate with the remote node. After initial handshakes node versions will be discovered
      * and updated.
      * </p>
@@ -152,7 +152,7 @@ public class DiscoveryNode implements Writeable, ToXContentFragment {
      * Creates a new {@link DiscoveryNode}
      * <p>
      * <b>Note:</b> if the version of the node is unknown {@link Version#minimumCompatibilityVersion()} should be used for the current
-     * version. it corresponds to the minimum version this elasticsearch version can communicate with. If a higher version is used
+     * version. it corresponds to the minimum version this opensearch version can communicate with. If a higher version is used
      * the node might not be able to communicate with the remote node. After initial handshakes node versions will be discovered
      * and updated.
      * </p>
@@ -174,7 +174,7 @@ public class DiscoveryNode implements Writeable, ToXContentFragment {
      * Creates a new {@link DiscoveryNode}.
      * <p>
      * <b>Note:</b> if the version of the node is unknown {@link Version#minimumCompatibilityVersion()} should be used for the current
-     * version. it corresponds to the minimum version this elasticsearch version can communicate with. If a higher version is used
+     * version. it corresponds to the minimum version this opensearch version can communicate with. If a higher version is used
      * the node might not be able to communicate with the remote node. After initial handshakes node versions will be discovered
      * and updated.
      * </p>

server/src/main/java/org/opensearch/cluster/routing/RoutingNodes.java

@@ -324,8 +324,8 @@ public class RoutingNodes implements Iterable<RoutingNode> {
      * Returns one active replica shard for the given shard id or <code>null</code> if
      * no active replica is found.
      *
-     * Since replicas could possibly be on nodes with a older version of ES than
+     * Since replicas could possibly be on nodes with a older version of OpenSearch than
-     * the primary is, this will return replicas on the highest version of ES.
+     * the primary is, this will return replicas on the highest version of OpenSearch.
      *
      */
     public ShardRouting activeReplicaWithHighestVersion(ShardId shardId) {

server/src/main/java/org/opensearch/cluster/service/ClusterApplierService.java

@@ -44,7 +44,7 @@ import org.opensearch.common.settings.Settings;
 import org.opensearch.common.unit.TimeValue;
 import org.opensearch.common.util.concurrent.OpenSearchExecutors;
 import org.opensearch.common.util.concurrent.OpenSearchRejectedExecutionException;
-import org.opensearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor;
+import org.opensearch.common.util.concurrent.PrioritizedOpenSearchThreadPoolExecutor;
 import org.opensearch.common.util.concurrent.ThreadContext;
 import org.opensearch.threadpool.Scheduler;
 import org.opensearch.threadpool.ThreadPool;
@@ -79,7 +79,7 @@ public class ClusterApplierService extends AbstractLifecycleComponent implements
 
     private volatile TimeValue slowTaskLoggingThreshold;
 
-    private volatile PrioritizedEsThreadPoolExecutor threadPoolExecutor;
+    private volatile PrioritizedOpenSearchThreadPoolExecutor threadPoolExecutor;
 
     /**
      * Those 3 state listeners are changing infrequently - CopyOnWriteArrayList is just fine
@@ -133,7 +133,7 @@ public class ClusterApplierService extends AbstractLifecycleComponent implements
         threadPoolExecutor = createThreadPoolExecutor();
     }
 
-    protected PrioritizedEsThreadPoolExecutor createThreadPoolExecutor() {
+    protected PrioritizedOpenSearchThreadPoolExecutor createThreadPoolExecutor() {
         return OpenSearchExecutors.newSinglePrioritizing(
             nodeName + "/" + CLUSTER_UPDATE_THREAD_NAME,
             daemonThreadFactory(nodeName, CLUSTER_UPDATE_THREAD_NAME),

server/src/main/java/org/opensearch/cluster/service/MasterService.java

@@ -51,7 +51,7 @@ import org.opensearch.common.util.concurrent.CountDown;
 import org.opensearch.common.util.concurrent.OpenSearchExecutors;
 import org.opensearch.common.util.concurrent.OpenSearchRejectedExecutionException;
 import org.opensearch.common.util.concurrent.FutureUtils;
-import org.opensearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor;
+import org.opensearch.common.util.concurrent.PrioritizedOpenSearchThreadPoolExecutor;
 import org.opensearch.common.util.concurrent.ThreadContext;
 import org.opensearch.discovery.Discovery;
 import org.opensearch.node.Node;
@@ -89,7 +89,7 @@ public class MasterService extends AbstractLifecycleComponent {
 
     protected final ThreadPool threadPool;
 
-    private volatile PrioritizedEsThreadPoolExecutor threadPoolExecutor;
+    private volatile PrioritizedOpenSearchThreadPoolExecutor threadPoolExecutor;
     private volatile Batcher taskBatcher;
 
     public MasterService(Settings settings, ClusterSettings clusterSettings, ThreadPool threadPool) {
@@ -121,7 +121,7 @@ public class MasterService extends AbstractLifecycleComponent {
         taskBatcher = new Batcher(logger, threadPoolExecutor);
     }
 
-    protected PrioritizedEsThreadPoolExecutor createThreadPoolExecutor() {
+    protected PrioritizedOpenSearchThreadPoolExecutor createThreadPoolExecutor() {
         return OpenSearchExecutors.newSinglePrioritizing(
                 nodeName + "/" + MASTER_UPDATE_THREAD_NAME,
                 daemonThreadFactory(nodeName, MASTER_UPDATE_THREAD_NAME),
@@ -132,7 +132,7 @@ public class MasterService extends AbstractLifecycleComponent {
     @SuppressWarnings("unchecked")
     class Batcher extends TaskBatcher {
 
-        Batcher(Logger logger, PrioritizedEsThreadPoolExecutor threadExecutor) {
+        Batcher(Logger logger, PrioritizedOpenSearchThreadPoolExecutor threadExecutor) {
             super(logger, threadExecutor);
         }
 

server/src/main/java/org/opensearch/cluster/service/TaskBatcher.java

@@ -24,7 +24,7 @@ import org.opensearch.common.Nullable;
 import org.opensearch.common.Priority;
 import org.opensearch.common.unit.TimeValue;
 import org.opensearch.common.util.concurrent.OpenSearchRejectedExecutionException;
-import org.opensearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor;
+import org.opensearch.common.util.concurrent.PrioritizedOpenSearchThreadPoolExecutor;
 
 import java.util.ArrayList;
 import java.util.Collections;
@@ -38,17 +38,17 @@ import java.util.function.Function;
 import java.util.stream.Collectors;
 
 /**
- * Batching support for {@link PrioritizedEsThreadPoolExecutor}
+ * Batching support for {@link PrioritizedOpenSearchThreadPoolExecutor}
  * Tasks that share the same batching key are batched (see {@link BatchedTask#batchingKey})
  */
 public abstract class TaskBatcher {
 
     private final Logger logger;
-    private final PrioritizedEsThreadPoolExecutor threadExecutor;
+    private final PrioritizedOpenSearchThreadPoolExecutor threadExecutor;
     // package visible for tests
     final Map<Object, LinkedHashSet<BatchedTask>> tasksPerBatchingKey = new HashMap<>();
 
-    public TaskBatcher(Logger logger, PrioritizedEsThreadPoolExecutor threadExecutor) {
+    public TaskBatcher(Logger logger, PrioritizedOpenSearchThreadPoolExecutor threadExecutor) {
         this.logger = logger;
         this.threadExecutor = threadExecutor;
     }

server/src/main/java/org/opensearch/common/geo/GeoUtils.java

@@ -578,7 +578,7 @@ public class GeoUtils {
     }
 
     /**
-     * Checks that the precision is within range supported by elasticsearch - between 1 and 12
+     * Checks that the precision is within range supported by opensearch - between 1 and 12
      *
      * Returns the precision value if it is in the range and throws an IllegalArgumentException if it
      * is outside the range.

server/src/main/java/org/opensearch/common/inject/InjectorImpl.java

@@ -729,7 +729,7 @@ class InjectorImpl implements Injector, Lookups {
 
     <T> Provider<T> getProviderOrThrow(final Key<T> key, Errors errors) throws ErrorsException {
         final InternalFactory<? extends T> factory = getInternalFactory(key, errors);
-        // ES: optimize for a common case of read only instance getting from the parent...
+        // OpenSearch: optimize for a common case of read only instance getting from the parent...
         if (factory instanceof InternalFactory.Instance) {
             return new Provider<T>() {
                 @Override

server/src/main/java/org/opensearch/common/inject/ModulesBuilder.java

@@ -41,7 +41,7 @@ public class ModulesBuilder implements Iterable<Module> {
     public Injector createInjector() {
         Injector injector = Guice.createInjector(modules);
         ((InjectorImpl) injector).clearCache();
-        // in ES, we always create all instances as if they are eager singletons
+        // in OpenSearch, we always create all instances as if they are eager singletons
         // this allows for considerable memory savings (no need to store construction info) as well as cycles
         ((InjectorImpl) injector).readOnlyAllSingletons();
         return injector;

server/src/main/java/org/opensearch/common/logging/ESJsonLayout.java

@@ -51,7 +51,7 @@ import java.util.stream.Stream;
  * <li>level - INFO, WARN etc</li>
  * <li>component - logger name, most of the times class name</li>
  * <li>cluster.name - taken from sys:es.logs.cluster_name system property because it is always set</li>
- * <li>node.name - taken from NodeNamePatternConverter, as it can be set in runtime as hostname when not set in elasticsearch.yml</li>
+ * <li>node.name - taken from NodeNamePatternConverter, as it can be set in runtime as hostname when not set in opensearch.yml</li>
  * <li>node_and_cluster_id - in json as node.id and cluster.uuid - taken from NodeAndClusterIdConverter and present
  * once clusterStateUpdate is first received</li>
  * <li>message - a json escaped message. Multiline messages will be converted to single line with new line explicitly

server/src/main/java/org/opensearch/common/logging/LogConfigurator.java

@@ -138,7 +138,7 @@ public class LogConfigurator {
 
     /**
      * Sets the node name. This is called before logging is configured if the
-     * node name is set in elasticsearch.yml. Otherwise it is called as soon
+     * node name is set in opensearch.yml. Otherwise it is called as soon
      * as the node id is available.
      */
     public static void setNodeName(String nodeName) {

server/src/main/java/org/opensearch/common/logging/NodeNamePatternConverter.java

@@ -32,7 +32,7 @@ import org.apache.lucene.util.SetOnce;
  * Converts {@code %node_name} in log4j patterns into the current node name.
  * We can't use a system property for this because the node name system
  * property is only set if the node name is explicitly defined in
- * elasticsearch.yml.
+ * opensearch.yml.
  */
 @Plugin(category = PatternConverter.CATEGORY, name = "NodeNamePatternConverter")
 @ConverterKeys({"node_name"})

server/src/main/java/org/opensearch/common/lucene/index/OpenSearchDirectoryReader.java

@@ -67,7 +67,7 @@ public final class OpenSearchDirectoryReader extends FilterDirectoryReader {
      * expose the given shard Id.
      *
      * @param reader the reader to wrap
-     * @param shardId the shard ID to expose via the elasticsearch internal reader wrappers.
+     * @param shardId the shard ID to expose via the opensearch internal reader wrappers.
      */
     public static OpenSearchDirectoryReader wrap(DirectoryReader reader, ShardId shardId) throws IOException {
         return new OpenSearchDirectoryReader(reader, new SubReaderWrapper(shardId), shardId);

server/src/main/java/org/opensearch/common/settings/BaseKeyStoreCommand.java

@@ -51,7 +51,7 @@ public abstract class BaseKeyStoreCommand extends KeyStoreAwareCommand {
                     throw new UserException(ExitCodes.DATA_ERROR, "Elasticsearch keystore not found at [" +
                         KeyStoreWrapper.keystorePath(env.configFile()) + "]. Use 'create' command to create one.");
                 } else if (options.has(forceOption) == false) {
-                    if (terminal.promptYesNo("The elasticsearch keystore does not exist. Do you want to create it?", false) == false) {
+                    if (terminal.promptYesNo("The opensearch keystore does not exist. Do you want to create it?", false) == false) {
                         terminal.println("Exiting without creating keystore.");
                         return;
                     }

server/src/main/java/org/opensearch/common/settings/KeyStoreWrapper.java

@@ -111,7 +111,7 @@ public class KeyStoreWrapper implements SecureSettings {
         "~!@#$%^&*-_=+?").toCharArray();
 
     /** The name of the keystore file to read and write. */
-    private static final String KEYSTORE_FILENAME = "elasticsearch.keystore";
+    private static final String KEYSTORE_FILENAME = "opensearch.keystore";
 
     /** The version of the metadata written before the keystore data. */
     static final int FORMAT_VERSION = 4;
@@ -517,7 +517,7 @@ public class KeyStoreWrapper implements SecureSettings {
         } catch (final AccessDeniedException e) {
             final String message = String.format(
                 Locale.ROOT,
-                "unable to create temporary keystore at [%s], write permissions required for [%s] or run [elasticsearch-keystore upgrade]",
+                "unable to create temporary keystore at [%s], write permissions required for [%s] or run [opensearch-keystore upgrade]",
                 configDir.resolve(tmpFile),
                 configDir);
             throw new UserException(ExitCodes.CONFIG, message, e);

server/src/main/java/org/opensearch/common/settings/SecureSetting.java

@@ -86,7 +86,7 @@ public abstract class SecureSetting<T> extends Setting<T> {
         if (secureSettings == null || secureSettings.getSettingNames().contains(getKey()) == false) {
             if (super.exists(settings)) {
                 throw new IllegalArgumentException("Setting [" + getKey() + "] is a secure setting" +
-                    " and must be stored inside the Elasticsearch keystore, but was found inside elasticsearch.yml");
+                    " and must be stored inside the Elasticsearch keystore, but was found inside opensearch.yml");
             }
             return getFallback(settings);
         }

server/src/main/java/org/opensearch/common/settings/Setting.java

@@ -65,7 +65,7 @@ import java.util.stream.Stream;
 /**
  * A setting. Encapsulates typical stuff like default value, parsing, and scope.
  * Some (SettingsProperty.Dynamic) can by modified at run time using the API.
- * All settings inside elasticsearch or in any of the plugins should use this type-safe and generic settings infrastructure
+ * All settings inside opensearch or in any of the plugins should use this type-safe and generic settings infrastructure
  * together with {@link AbstractScopedSettings}. This class contains several utility methods that makes it straight forward
  * to add settings for the majority of the cases. For instance a simple boolean settings can be defined like this:
  * <pre>{@code
@@ -518,7 +518,7 @@ public class Setting<T> implements ToXContentObject {
         SecureSettings secureSettings = settings.getSecureSettings();
         if (secureSettings != null && secureSettings.getSettingNames().contains(getKey())) {
             throw new IllegalArgumentException("Setting [" + getKey() + "] is a non-secure setting" +
-                " and must be stored inside elasticsearch.yml, but was found inside the Elasticsearch keystore");
+                " and must be stored inside opensearch.yml, but was found inside the Elasticsearch keystore");
         }
         return settings.get(getKey(), defaultValue.apply(settings));
     }

server/src/main/java/org/opensearch/common/settings/SettingsModule.java

@@ -108,7 +108,7 @@ public class SettingsModule implements Module {
                 builder.append(System.lineSeparator());
                 int count = 0;
                 for (String word : ("Since elasticsearch 5.x index level settings can NOT be set on the nodes configuration like " +
-                    "the elasticsearch.yaml, in system properties or command line arguments." +
+                    "the opensearch.yaml, in system properties or command line arguments." +
                     "In order to upgrade all indices the settings must be updated via the /${index}/_settings API. " +
                     "Unless all settings are dynamic all indices must be closed in order to apply the upgrade" +
                     "Indices created in the future should use index templates to set default values."

server/src/main/java/org/opensearch/common/util/concurrent/BaseFuture.java

@@ -166,7 +166,7 @@ public abstract class BaseFuture<V> implements Future<V> {
         // call stack, so we rethrow it.
 
         // we want to notify the listeners we have with errors as well, as it breaks
-        // how we work in ES in terms of using assertions
+        // how we work in OpenSearch in terms of using assertions
 //        if (throwable instanceof Error) {
 //            throw (Error) throwable;
 //        }

server/src/main/java/org/opensearch/common/util/concurrent/OpenSearchExecutors.java

@@ -96,29 +96,29 @@ public class OpenSearchExecutors {
         return NODE_PROCESSORS_SETTING.get(settings);
     }
 
-    public static PrioritizedEsThreadPoolExecutor newSinglePrioritizing(String name, ThreadFactory threadFactory,
+    public static PrioritizedOpenSearchThreadPoolExecutor newSinglePrioritizing(String name, ThreadFactory threadFactory,
-                                                                        ThreadContext contextHolder, ScheduledExecutorService timer) {
+                                                                                ThreadContext contextHolder, ScheduledExecutorService timer) {
-        return new PrioritizedEsThreadPoolExecutor(name, 1, 1, 0L, TimeUnit.MILLISECONDS, threadFactory, contextHolder, timer);
+        return new PrioritizedOpenSearchThreadPoolExecutor(name, 1, 1, 0L, TimeUnit.MILLISECONDS, threadFactory, contextHolder, timer);
     }
 
-    public static EsThreadPoolExecutor newScaling(String name, int min, int max, long keepAliveTime, TimeUnit unit,
+    public static OpenSearchThreadPoolExecutor newScaling(String name, int min, int max, long keepAliveTime, TimeUnit unit,
-                                                  ThreadFactory threadFactory, ThreadContext contextHolder) {
+                                                          ThreadFactory threadFactory, ThreadContext contextHolder) {
         ExecutorScalingQueue<Runnable> queue = new ExecutorScalingQueue<>();
-        EsThreadPoolExecutor executor =
+        OpenSearchThreadPoolExecutor executor =
-            new EsThreadPoolExecutor(name, min, max, keepAliveTime, unit, queue, threadFactory, new ForceQueuePolicy(), contextHolder);
+            new OpenSearchThreadPoolExecutor(name, min, max, keepAliveTime, unit, queue, threadFactory, new ForceQueuePolicy(), contextHolder);
         queue.executor = executor;
         return executor;
     }
 
-    public static EsThreadPoolExecutor newFixed(String name, int size, int queueCapacity,
+    public static OpenSearchThreadPoolExecutor newFixed(String name, int size, int queueCapacity,
-                                                ThreadFactory threadFactory, ThreadContext contextHolder) {
+                                                        ThreadFactory threadFactory, ThreadContext contextHolder) {
         BlockingQueue<Runnable> queue;
         if (queueCapacity < 0) {
             queue = ConcurrentCollections.newBlockingQueue();
         } else {
             queue = new SizeBlockingQueue<>(ConcurrentCollections.<Runnable>newBlockingQueue(), queueCapacity);
         }
-        return new EsThreadPoolExecutor(name, size, size, 0, TimeUnit.MILLISECONDS,
+        return new OpenSearchThreadPoolExecutor(name, size, size, 0, TimeUnit.MILLISECONDS,
             queue, threadFactory, new OpenSearchAbortPolicy(), contextHolder);
     }
 
@@ -131,16 +131,16 @@ public class OpenSearchExecutors {
      * @param maxQueueSize maximum queue size that the queue can be adjusted to
      * @param frameSize number of tasks during which stats are collected before adjusting queue size
      */
-    public static EsThreadPoolExecutor newAutoQueueFixed(String name, int size, int initialQueueCapacity, int minQueueSize,
+    public static OpenSearchThreadPoolExecutor newAutoQueueFixed(String name, int size, int initialQueueCapacity, int minQueueSize,
-                                                         int maxQueueSize, int frameSize, TimeValue targetedResponseTime,
+                                                                 int maxQueueSize, int frameSize, TimeValue targetedResponseTime,
-                                                         ThreadFactory threadFactory, ThreadContext contextHolder) {
+                                                                 ThreadFactory threadFactory, ThreadContext contextHolder) {
         if (initialQueueCapacity <= 0) {
             throw new IllegalArgumentException("initial queue capacity for [" + name + "] executor must be positive, got: " +
                             initialQueueCapacity);
         }
         ResizableBlockingQueue<Runnable> queue =
                 new ResizableBlockingQueue<>(ConcurrentCollections.<Runnable>newBlockingQueue(), initialQueueCapacity);
-        return new QueueResizingEsThreadPoolExecutor(name, size, size, 0, TimeUnit.MILLISECONDS,
+        return new QueueResizingOpenSearchThreadPoolExecutor(name, size, size, 0, TimeUnit.MILLISECONDS,
                 queue, minQueueSize, maxQueueSize, TimedRunnable::new, frameSize, targetedResponseTime, threadFactory,
                 new OpenSearchAbortPolicy(), contextHolder);
     }
@@ -249,7 +249,7 @@ public class OpenSearchExecutors {
 
     public static String threadName(final String nodeName, final String namePrefix) {
         // TODO missing node names should only be allowed in tests
-        return "elasticsearch" + (nodeName.isEmpty() ? "" : "[") + nodeName + (nodeName.isEmpty() ? "" : "]") + "[" + namePrefix + "]";
+        return "opensearch" + (nodeName.isEmpty() ? "" : "[") + nodeName + (nodeName.isEmpty() ? "" : "]") + "[" + namePrefix + "]";
     }
 
     public static ThreadFactory daemonThreadFactory(Settings settings, String namePrefix) {

server/src/main/java/org/opensearch/common/util/concurrent/OpenSearchThreadPoolExecutor.java

@@ -30,7 +30,7 @@ import java.util.stream.Stream;
 /**
  * An extension to thread pool executor, allowing (in the future) to add specific additional stats to it.
  */
-public class EsThreadPoolExecutor extends ThreadPoolExecutor {
+public class OpenSearchThreadPoolExecutor extends ThreadPoolExecutor {
 
     private final ThreadContext contextHolder;
     private volatile ShutdownListener listener;
@@ -45,15 +45,15 @@ public class EsThreadPoolExecutor extends ThreadPoolExecutor {
         return name;
     }
 
-    EsThreadPoolExecutor(String name, int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit,
+    OpenSearchThreadPoolExecutor(String name, int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit,
-            BlockingQueue<Runnable> workQueue, ThreadFactory threadFactory, ThreadContext contextHolder) {
+                                 BlockingQueue<Runnable> workQueue, ThreadFactory threadFactory, ThreadContext contextHolder) {
         this(name, corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue, threadFactory, new OpenSearchAbortPolicy(), contextHolder);
     }
 
     @SuppressForbidden(reason = "properly rethrowing errors, see OpenSearchExecutors.rethrowErrors")
-    EsThreadPoolExecutor(String name, int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit,
+    OpenSearchThreadPoolExecutor(String name, int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit,
-            BlockingQueue<Runnable> workQueue, ThreadFactory threadFactory, XRejectedExecutionHandler handler,
+                                 BlockingQueue<Runnable> workQueue, ThreadFactory threadFactory, XRejectedExecutionHandler handler,
-            ThreadContext contextHolder) {
+                                 ThreadContext contextHolder) {
         super(corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue, threadFactory, handler);
         this.name = name;
         this.contextHolder = contextHolder;

server/src/main/java/org/opensearch/common/util/concurrent/PrioritizedOpenSearchThreadPoolExecutor.java

@@ -41,15 +41,15 @@ import java.util.concurrent.atomic.AtomicLong;
  * <p>
  * Note, if two tasks have the same priority, the first to arrive will be executed first (FIFO style).
  */
-public class PrioritizedEsThreadPoolExecutor extends EsThreadPoolExecutor {
+public class PrioritizedOpenSearchThreadPoolExecutor extends OpenSearchThreadPoolExecutor {
 
     private static final TimeValue NO_WAIT_TIME_VALUE = TimeValue.timeValueMillis(0);
     private final AtomicLong insertionOrder = new AtomicLong();
     private final Queue<Runnable> current = ConcurrentCollections.newQueue();
     private final ScheduledExecutorService timer;
 
-    public PrioritizedEsThreadPoolExecutor(String name, int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit,
+    public PrioritizedOpenSearchThreadPoolExecutor(String name, int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit,
-                                    ThreadFactory threadFactory, ThreadContext contextHolder, ScheduledExecutorService timer) {
+                                                   ThreadFactory threadFactory, ThreadContext contextHolder, ScheduledExecutorService timer) {
         super(name, corePoolSize, maximumPoolSize, keepAliveTime, unit, new PriorityBlockingQueue<>(), threadFactory, contextHolder);
         this.timer = timer;
     }

server/src/main/java/org/opensearch/common/util/concurrent/QueueResizingOpenSearchThreadPoolExecutor.java

@@ -36,12 +36,12 @@ import java.util.function.Function;
  * An extension to thread pool executor, which automatically adjusts the queue size of the
  * {@code ResizableBlockingQueue} according to Little's Law.
  */
-public final class QueueResizingEsThreadPoolExecutor extends EsThreadPoolExecutor {
+public final class QueueResizingOpenSearchThreadPoolExecutor extends OpenSearchThreadPoolExecutor {
 
     // This is a random starting point alpha. TODO: revisit this with actual testing and/or make it configurable
     public static double EWMA_ALPHA = 0.3;
 
-    private static final Logger logger = LogManager.getLogger(QueueResizingEsThreadPoolExecutor.class);
+    private static final Logger logger = LogManager.getLogger(QueueResizingOpenSearchThreadPoolExecutor.class);
     // The amount the queue size is adjusted by for each calcuation
     private static final int QUEUE_ADJUSTMENT_AMOUNT = 50;
 
@@ -58,11 +58,11 @@ public final class QueueResizingEsThreadPoolExecutor extends EsThreadPoolExecuto
 
     private long startNs;
 
-    QueueResizingEsThreadPoolExecutor(String name, int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit,
+    QueueResizingOpenSearchThreadPoolExecutor(String name, int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit,
-                                      ResizableBlockingQueue<Runnable> workQueue, int minQueueSize, int maxQueueSize,
+                                              ResizableBlockingQueue<Runnable> workQueue, int minQueueSize, int maxQueueSize,
-                                      Function<Runnable, WrappedRunnable> runnableWrapper, final int tasksPerFrame,
+                                              Function<Runnable, WrappedRunnable> runnableWrapper, final int tasksPerFrame,
-                                      TimeValue targetedResponseTime, ThreadFactory threadFactory, XRejectedExecutionHandler handler,
+                                              TimeValue targetedResponseTime, ThreadFactory threadFactory, XRejectedExecutionHandler handler,
-                                      ThreadContext contextHolder) {
+                                              ThreadContext contextHolder) {
         super(name, corePoolSize, maximumPoolSize, keepAliveTime, unit,
                 workQueue, threadFactory, handler, contextHolder);
         this.runnableWrapper = runnableWrapper;

server/src/main/java/org/opensearch/common/util/concurrent/ThreadContext.java

@@ -62,7 +62,7 @@ import static org.opensearch.http.HttpTransportSettings.SETTING_HTTP_MAX_WARNING
  * have out of the box support for {@link ThreadContext} and all threads spawned will inherit the {@link ThreadContext} from the thread
  * that it is forking from.". Network calls will also preserve the senders headers automatically.
  * <p>
- * Consumers of ThreadContext usually don't need to interact with adding or stashing contexts. Every elasticsearch thread is managed by
+ * Consumers of ThreadContext usually don't need to interact with adding or stashing contexts. Every opensearch thread is managed by
  * a thread pool or executor being responsible for stashing and restoring the threads context. For instance if a network request is
  * received, all headers are deserialized from the network and directly added as the headers of the threads {@link ThreadContext}
  * (see {@link #readHeaders(StreamInput)}. In order to not modify the context that is currently active on this thread the network code

server/src/main/java/org/opensearch/common/xcontent/XContentOpenSearchExtension.java

@@ -72,7 +72,7 @@ public class XContentOpenSearchExtension implements XContentBuilderExtension {
     public Map<Class<?>, XContentBuilder.Writer> getXContentWriters() {
         Map<Class<?>, XContentBuilder.Writer> writers = new HashMap<>();
 
-        // Fully-qualified here to reduce ambiguity around our (ES') Version class
+        // Fully-qualified here to reduce ambiguity around our (OpenSearch') Version class
         writers.put(org.apache.lucene.util.Version.class, (b, v) -> b.value(Objects.toString(v)));
         writers.put(DateTimeZone.class, (b, v) -> b.value(Objects.toString(v)));
         writers.put(CachedDateTimeZone.class, (b, v) -> b.value(Objects.toString(v)));

server/src/main/java/org/opensearch/discovery/zen/UnicastZenPing.java

@@ -43,7 +43,7 @@ import org.opensearch.common.util.CollectionUtils;
 import org.opensearch.common.util.concurrent.AbstractRunnable;
 import org.opensearch.common.util.concurrent.ConcurrentCollections;
 import org.opensearch.common.util.concurrent.OpenSearchExecutors;
-import org.opensearch.common.util.concurrent.EsThreadPoolExecutor;
+import org.opensearch.common.util.concurrent.OpenSearchThreadPoolExecutor;
 import org.opensearch.common.util.concurrent.KeyedLock;
 import org.opensearch.core.internal.io.IOUtils;
 import org.opensearch.discovery.SeedHostsProvider;
@@ -108,7 +108,7 @@ public class UnicastZenPing implements ZenPing {
 
     private final SeedHostsProvider hostsProvider;
 
-    protected final EsThreadPoolExecutor unicastZenPingExecutorService;
+    protected final OpenSearchThreadPoolExecutor unicastZenPingExecutorService;
 
     private final TimeValue resolveTimeout;
 

server/src/main/java/org/opensearch/gateway/GatewayMetaState.java

@@ -46,7 +46,7 @@ import org.opensearch.common.collect.Tuple;
 import org.opensearch.common.settings.Settings;
 import org.opensearch.common.util.concurrent.AbstractRunnable;
 import org.opensearch.common.util.concurrent.OpenSearchExecutors;
-import org.opensearch.common.util.concurrent.EsThreadPoolExecutor;
+import org.opensearch.common.util.concurrent.OpenSearchThreadPoolExecutor;
 import org.opensearch.core.internal.io.IOUtils;
 import org.opensearch.discovery.DiscoveryModule;
 import org.opensearch.env.NodeMetadata;
@@ -334,7 +334,7 @@ public class GatewayMetaState implements Closeable {
 
         static final String THREAD_NAME = "AsyncLucenePersistedState#updateTask";
 
-        private final EsThreadPoolExecutor threadPoolExecutor;
+        private final OpenSearchThreadPoolExecutor threadPoolExecutor;
         private final PersistedState persistedState;
 
         boolean newCurrentTermQueued = false;

server/src/main/java/org/opensearch/gateway/TransportNodesListGatewayStartedShards.java

@@ -125,7 +125,7 @@ public class TransportNodesListGatewayStartedShards extends
                     if (request.getCustomDataPath() != null) {
                         customDataPath = request.getCustomDataPath();
                     } else {
-                        // TODO: Fallback for BWC with older ES versions. Remove once request.getCustomDataPath() always returns non-null
+                        // TODO: Fallback for BWC with older OpenSearch versions. Remove once request.getCustomDataPath() always returns non-null
                         final IndexMetadata metadata = clusterService.state().metadata().index(shardId.getIndex());
                         if (metadata != null) {
                             customDataPath = new IndexSettings(metadata, settings).customDataPath();

server/src/main/java/org/opensearch/index/MergePolicyConfig.java

@@ -29,7 +29,7 @@ import org.opensearch.common.unit.ByteSizeUnit;
 import org.opensearch.common.unit.ByteSizeValue;
 
 /**
- * A shard in elasticsearch is a Lucene index, and a Lucene index is broken
+ * A shard in opensearch is a Lucene index, and a Lucene index is broken
  * down into segments. Segments are internal storage elements in the index
  * where the index data is stored, and are immutable up to delete markers.
  * Segments are, periodically, merged into larger segments to keep the

server/src/main/java/org/opensearch/index/mapper/SeqNoFieldMapper.java

@@ -48,7 +48,7 @@ import java.util.function.Supplier;
  * doing range searches. Therefore the {@code _seq_no} field is stored both
  * as a numeric doc value and as numeric indexed field.
  *
- * This mapper also manages the primary term field, which has no ES named
+ * This mapper also manages the primary term field, which has no OpenSearch named
  * equivalent. The primary term is only used during collision after receiving
  * identical seq# values for two document copies. The primary term is stored as
  * a doc value field without being indexed, since it is only intended for use

server/src/main/java/org/opensearch/index/query/NestedQueryBuilder.java

@@ -46,7 +46,7 @@ import org.opensearch.common.lucene.search.TopDocsAndMaxScore;
 import org.opensearch.common.xcontent.XContentBuilder;
 import org.opensearch.common.xcontent.XContentParser;
 import org.opensearch.index.mapper.ObjectMapper;
-import org.opensearch.index.search.ESToParentBlockJoinQuery;
+import org.opensearch.index.search.OpenSearchToParentBlockJoinQuery;
 import org.opensearch.index.search.NestedHelper;
 import org.opensearch.search.SearchHit;
 import org.opensearch.search.fetch.subphase.InnerHitsContext;
@@ -240,7 +240,7 @@ public class NestedQueryBuilder extends AbstractQueryBuilder<NestedQueryBuilder>
 
     public static String scoreModeAsString(ScoreMode scoreMode) {
         if (scoreMode == ScoreMode.Total) {
-            // Lucene uses 'total' but 'sum' is more consistent with other elasticsearch APIs
+            // Lucene uses 'total' but 'sum' is more consistent with other opensearch APIs
             return "sum";
         } else {
             return scoreMode.name().toLowerCase(Locale.ROOT);
@@ -306,7 +306,7 @@ public class NestedQueryBuilder extends AbstractQueryBuilder<NestedQueryBuilder>
             innerQuery = Queries.filtered(innerQuery, nestedObjectMapper.nestedTypeFilter());
         }
 
-        return new ESToParentBlockJoinQuery(innerQuery, parentFilter, scoreMode,
+        return new OpenSearchToParentBlockJoinQuery(innerQuery, parentFilter, scoreMode,
                 objectMapper == null ? null : objectMapper.fullPath());
     }
 

server/src/main/java/org/opensearch/index/query/SimpleQueryStringBuilder.java

@@ -139,7 +139,7 @@ public class SimpleQueryStringBuilder extends AbstractQueryBuilder<SimpleQuerySt
     /** Whether or not the lenient flag has been set or not */
     private boolean lenientSet = false;
 
-    /** Further search settings needed by the ES specific query string parser only. */
+    /** Further search settings needed by the OpenSearch specific query string parser only. */
     private Settings settings = new Settings();
 
     /** Construct a new simple query with this query string. */

server/src/main/java/org/opensearch/index/query/SpanNearQueryBuilder.java

@@ -233,7 +233,7 @@ public class SpanNearQueryBuilder extends AbstractQueryBuilder<SpanNearQueryBuil
         builder.setSlop(slop);
         /*
          * Lucene SpanNearQuery throws exceptions for certain use cases like adding gap to a
-         * unordered SpanNearQuery. Should ES have the same checks or wrap those thrown exceptions?
+         * unordered SpanNearQuery. Should OpenSearch have the same checks or wrap those thrown exceptions?
          */
         if (isGap) {
             int gap = ((SpanGapQueryBuilder) queryBuilder).width();

server/src/main/java/org/opensearch/index/search/NestedHelper.java

@@ -86,8 +86,8 @@ public final class NestedHelper {
                         .map(BooleanClause::getQuery)
                         .anyMatch(this::mightMatchNestedDocs);
             }
-        } else if (query instanceof ESToParentBlockJoinQuery) {
+        } else if (query instanceof OpenSearchToParentBlockJoinQuery) {
-            return ((ESToParentBlockJoinQuery) query).getPath() != null;
+            return ((OpenSearchToParentBlockJoinQuery) query).getPath() != null;
         } else {
             return true;
         }

server/src/main/java/org/opensearch/index/seqno/ReplicationTracker.java

@@ -649,7 +649,7 @@ public class ReplicationTracker extends AbstractIndexShardComponent implements L
             if (in.getVersion().onOrAfter(Version.V_6_3_0)) {
                 this.tracked = in.readBoolean();
             } else {
-                // Every in-sync shard copy is also tracked (see invariant). This was the case even in earlier ES versions.
+                // Every in-sync shard copy is also tracked (see invariant). This was the case even in earlier OpenSearch versions.
                 // Non in-sync shard copies might be tracked or not. As this information here is only serialized during relocation hand-off,
                 // after which replica recoveries cannot complete anymore (i.e. they cannot move from in-sync == false to in-sync == true),
                 // we can treat non in-sync replica shard copies as untracked. They will go through a fresh recovery against the new

server/src/main/java/org/opensearch/indices/store/TransportNodesListShardStoreMetadata.java

@@ -148,7 +148,7 @@ public class TransportNodesListShardStoreMetadata extends TransportNodesAction<T
             if (request.getCustomDataPath() != null) {
                 customDataPath = request.getCustomDataPath();
             } else {
-                // TODO: Fallback for BWC with older ES versions. Remove this once request.getCustomDataPath() always returns non-null
+                // TODO: Fallback for BWC with older predecessor (ES) versions. Remove this once request.getCustomDataPath() always returns non-null
                 if (indexService != null) {
                     customDataPath = indexService.getIndexSettings().customDataPath();
                 } else {

server/src/main/java/org/opensearch/repositories/RepositoryData.java

@@ -510,7 +510,7 @@ public final class RepositoryData {
             builder.field(MIN_VERSION, SnapshotsService.INDEX_GEN_IN_REPO_DATA_VERSION.toString());
             builder.field(INDEX_METADATA_IDENTIFIERS, indexMetaDataGenerations.identifiers);
         } else if (shouldWriteShardGens) {
-            // Add min version field to make it impossible for older ES versions to deserialize this object
+            // Add min version field to make it impossible for older OpenSearch versions to deserialize this object
             builder.field(MIN_VERSION, SnapshotsService.SHARD_GEN_IN_REPO_DATA_VERSION.toString());
         }
         builder.endObject();

server/src/main/java/org/opensearch/repositories/blobstore/package-info.java

@@ -59,7 +59,7 @@
  *      |  |             in the repository
  *      |  |- meta-20131010.dat - JSON Serialized {@link org.opensearch.cluster.metadata.IndexMetadata } for index "foo"
  *      |  |- 0/ - data for shard "0" of index "foo"
- *      |  |  |- __1                      \  (files with numeric names were created by older ES versions)
+ *      |  |  |- __1                      \  (files with numeric names were created by older preceding ES versions)
  *      |  |  |- __2                      |
  *      |  |  |- __VPO5oDMVT5y4Akv8T_AO_A |- files from different segments see snap-* for their mappings to real segment files
  *      |  |  |- __1gbJy18wS_2kv1qI7FgKuQ |
@@ -70,7 +70,7 @@
  *      |  |  |- snap-20131011.dat - SMILE serialized {@link org.opensearch.index.snapshots.blobstore.BlobStoreIndexShardSnapshot} for
  *      |  |  |                      snapshot "20131011"
  *      |  |  |- index-123         - SMILE serialized {@link org.opensearch.index.snapshots.blobstore.BlobStoreIndexShardSnapshots} for
- *      |  |  |                      the shard (files with numeric suffixes were created by older versions, newer ES versions use a uuid
+ *      |  |  |                      the shard (files with numeric suffixes were created by older versions, newer OpenSearch versions use a uuid
  *      |  |  |                      suffix instead)
  *      |  |
  *      |  |- 1/ - data for shard "1" of index "foo"

server/src/main/java/org/opensearch/rest/action/cat/RestAllocationAction.java

@@ -95,8 +95,8 @@ public class RestAllocationAction extends AbstractCatAction {
         final Table table = new Table();
         table.startHeaders();
         table.addCell("shards", "alias:s;text-align:right;desc:number of shards on node");
-        table.addCell("disk.indices", "alias:di,diskIndices;text-align:right;desc:disk used by ES indices");
+        table.addCell("disk.indices", "alias:di,diskIndices;text-align:right;desc:disk used by OpenSearch indices");
-        table.addCell("disk.used", "alias:du,diskUsed;text-align:right;desc:disk used (total, not just ES)");
+        table.addCell("disk.used", "alias:du,diskUsed;text-align:right;desc:disk used (total, not just OpenSearch)");
         table.addCell("disk.avail", "alias:da,diskAvail;text-align:right;desc:disk available");
         table.addCell("disk.total", "alias:dt,diskTotal;text-align:right;desc:total capacity of all volumes");
         table.addCell("disk.percent", "alias:dp,diskPercent;text-align:right;desc:percent disk used");

server/src/main/java/org/opensearch/search/aggregations/bucket/nested/ReverseNestedAggregator.java

@@ -61,7 +61,7 @@ public class ReverseNestedAggregator extends BucketsAggregator implements Single
 
     @Override
     protected LeafBucketCollector getLeafCollector(LeafReaderContext ctx, final LeafBucketCollector sub) throws IOException {
-        // In ES if parent is deleted, then also the children are deleted, so the child docs this agg receives
+        // In OpenSearch if parent is deleted, then also the children are deleted, so the child docs this agg receives
         // must belong to parent docs that is alive. For this reason acceptedDocs can be null here.
         final BitSet parentDocs = parentBitsetProducer.getBitSet(ctx);
         if (parentDocs == null) {

server/src/main/java/org/opensearch/search/aggregations/bucket/sampler/DiversifiedBytesHashSamplerAggregator.java

@@ -95,7 +95,7 @@ public class DiversifiedBytesHashSamplerAggregator extends SamplerAggregator {
         }
 
         // This class extends the DiversifiedTopDocsCollector and provides
-        // a lookup from elasticsearch's ValuesSource
+        // a lookup from opensearch's ValuesSource
         class ValuesDiversifiedTopDocsCollector extends DiversifiedTopDocsCollector {
 
             private SortedBinaryDocValues values;

server/src/main/java/org/opensearch/search/aggregations/bucket/sampler/DiversifiedMapSamplerAggregator.java

@@ -101,7 +101,7 @@ public class DiversifiedMapSamplerAggregator extends SamplerAggregator {
         }
 
         // This class extends the DiversifiedTopDocsCollector and provides
-        // a lookup from elasticsearch's ValuesSource
+        // a lookup from opensearch's ValuesSource
         class ValuesDiversifiedTopDocsCollector extends DiversifiedTopDocsCollector {
 
             private SortedBinaryDocValues values;

server/src/main/java/org/opensearch/search/aggregations/bucket/sampler/DiversifiedNumericSamplerAggregator.java

@@ -88,7 +88,7 @@ public class DiversifiedNumericSamplerAggregator extends SamplerAggregator {
         }
 
         // This class extends the DiversifiedTopDocsCollector and provides
-        // a lookup from elasticsearch's ValuesSource
+        // a lookup from opensearch's ValuesSource
         class ValuesDiversifiedTopDocsCollector extends DiversifiedTopDocsCollector {
 
             private SortedNumericDocValues values;

server/src/main/java/org/opensearch/search/aggregations/bucket/sampler/DiversifiedOrdinalsSamplerAggregator.java

@@ -90,7 +90,7 @@ public class DiversifiedOrdinalsSamplerAggregator extends SamplerAggregator {
         }
 
         // This class extends the DiversifiedTopDocsCollector and provides
-        // a lookup from elasticsearch's ValuesSource
+        // a lookup from opensearch's ValuesSource
         class ValuesDiversifiedTopDocsCollector extends DiversifiedTopDocsCollector {
 
 

server/src/main/java/org/opensearch/search/internal/ContextIndexSearcher.java

@@ -183,7 +183,7 @@ public class ContextIndexSearcher extends IndexSearcher implements Releasable {
         }
         TopFieldDocs mergedTopDocs = (TopFieldDocs) manager.reduce(collectors);
         // Lucene sets shards indexes during merging of topDocs from different collectors
-        // We need to reset shard index; ES will set shard index later during reduce stage
+        // We need to reset shard index; OpenSearch will set shard index later during reduce stage
         for (ScoreDoc scoreDoc : mergedTopDocs.scoreDocs) {
             scoreDoc.shardIndex = -1;
         }

server/src/main/java/org/opensearch/search/query/QueryPhase.java

@@ -51,7 +51,7 @@ import org.opensearch.common.Booleans;
 import org.opensearch.common.CheckedConsumer;
 import org.opensearch.common.lucene.Lucene;
 import org.opensearch.common.lucene.search.TopDocsAndMaxScore;
-import org.opensearch.common.util.concurrent.QueueResizingEsThreadPoolExecutor;
+import org.opensearch.common.util.concurrent.QueueResizingOpenSearchThreadPoolExecutor;
 import org.opensearch.index.IndexSortConfig;
 import org.opensearch.index.mapper.DateFieldMapper.DateFieldType;
 import org.opensearch.index.mapper.MappedFieldType;
@@ -303,8 +303,8 @@ public class QueryPhase {
                 }
 
                 ExecutorService executor = searchContext.indexShard().getThreadPool().executor(ThreadPool.Names.SEARCH);
-                if (executor instanceof QueueResizingEsThreadPoolExecutor) {
+                if (executor instanceof QueueResizingOpenSearchThreadPoolExecutor) {
-                    QueueResizingEsThreadPoolExecutor rExecutor = (QueueResizingEsThreadPoolExecutor) executor;
+                    QueueResizingOpenSearchThreadPoolExecutor rExecutor = (QueueResizingOpenSearchThreadPoolExecutor) executor;
                     queryResult.nodeQueueSize(rExecutor.getCurrentQueueSize());
                     queryResult.serviceTimeEWMA((long) rExecutor.getTaskExecutionEWMA());
                 }

server/src/main/java/org/opensearch/threadpool/ThreadPool.java

@@ -32,8 +32,8 @@ import org.opensearch.common.settings.Settings;
 import org.opensearch.common.unit.SizeValue;
 import org.opensearch.common.unit.TimeValue;
 import org.opensearch.common.util.concurrent.OpenSearchExecutors;
-import org.opensearch.common.util.concurrent.EsThreadPoolExecutor;
 import org.opensearch.common.util.concurrent.OpenSearchRejectedExecutionException;
+import org.opensearch.common.util.concurrent.OpenSearchThreadPoolExecutor;
 import org.opensearch.common.util.concurrent.ThreadContext;
 import org.opensearch.common.util.concurrent.XRejectedExecutionHandler;
 import org.opensearch.common.xcontent.ToXContentFragment;
@@ -606,7 +606,7 @@ public class ThreadPool implements ReportingService<ThreadPoolInfo>, Scheduler {
         public final Info info;
 
         ExecutorHolder(ExecutorService executor, Info info) {
-            assert executor instanceof EsThreadPoolExecutor || executor == DIRECT_EXECUTOR;
+            assert executor instanceof OpenSearchThreadPoolExecutor || executor == DIRECT_EXECUTOR;
             this.executor = executor;
             this.info = info;
         }

server/src/test/java/org/elasticsearch/cluster/InternalClusterInfoServiceSchedulingTests.java

@@ -39,7 +39,7 @@ import org.opensearch.cluster.service.FakeThreadPoolMasterService;
 import org.elasticsearch.cluster.service.MasterService;
 import org.opensearch.common.settings.ClusterSettings;
 import org.opensearch.common.settings.Settings;
-import org.opensearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor;
+import org.opensearch.common.util.concurrent.PrioritizedOpenSearchThreadPoolExecutor;
 import org.opensearch.node.Node;
 import org.opensearch.test.ClusterServiceUtils;
 import org.opensearch.test.OpenSearchTestCase;
@@ -72,7 +72,7 @@ public class InternalClusterInfoServiceSchedulingTests extends OpenSearchTestCas
 
         final ClusterApplierService clusterApplierService = new ClusterApplierService("test", settings, clusterSettings, threadPool) {
             @Override
-            protected PrioritizedEsThreadPoolExecutor createThreadPoolExecutor() {
+            protected PrioritizedOpenSearchThreadPoolExecutor createThreadPoolExecutor() {
                 return new MockSinglePrioritizingExecutor("mock-executor", deterministicTaskQueue, threadPool);
             }
         };

server/src/test/java/org/elasticsearch/cluster/action/index/MappingUpdatedActionTests.java

@@ -35,12 +35,12 @@ import org.opensearch.cluster.service.ClusterService;
 import org.opensearch.common.collect.Map;
 import org.opensearch.common.settings.ClusterSettings;
 import org.opensearch.common.settings.Settings;
-import org.elasticsearch.index.Index;
+import org.opensearch.index.Index;
-import org.elasticsearch.index.mapper.ContentPath;
+import org.opensearch.index.mapper.ContentPath;
-import org.elasticsearch.index.mapper.Mapper;
+import org.opensearch.index.mapper.Mapper;
-import org.elasticsearch.index.mapper.Mapping;
+import org.opensearch.index.mapper.Mapping;
-import org.elasticsearch.index.mapper.MetadataFieldMapper;
+import org.opensearch.index.mapper.MetadataFieldMapper;
-import org.elasticsearch.index.mapper.RootObjectMapper;
+import org.opensearch.index.mapper.RootObjectMapper;
 import org.opensearch.test.OpenSearchTestCase;
 
 import java.util.List;

server/src/test/java/org/elasticsearch/cluster/coordination/PreVoteCollectorTests.java

@@ -27,7 +27,7 @@ import org.opensearch.cluster.node.DiscoveryNode;
 import org.opensearch.common.io.stream.StreamInput;
 import org.opensearch.common.lease.Releasable;
 import org.opensearch.common.settings.Settings;
-import org.elasticsearch.monitor.StatusInfo;
+import org.opensearch.monitor.StatusInfo;
 import org.opensearch.test.OpenSearchTestCase;
 import org.opensearch.test.transport.MockTransport;
 import org.opensearch.transport.ConnectTransportException;
@@ -58,8 +58,8 @@ import java.util.concurrent.atomic.AtomicReference;
 
 import static java.util.Collections.emptySet;
 import static org.opensearch.cluster.coordination.PreVoteCollector.REQUEST_PRE_VOTE_ACTION_NAME;
-import static org.elasticsearch.monitor.StatusInfo.Status.HEALTHY;
+import static org.opensearch.monitor.StatusInfo.Status.HEALTHY;
-import static org.elasticsearch.monitor.StatusInfo.Status.UNHEALTHY;
+import static org.opensearch.monitor.StatusInfo.Status.UNHEALTHY;
 import static org.opensearch.node.Node.NODE_NAME_SETTING;
 import static org.opensearch.threadpool.ThreadPool.Names.SAME;
 import static org.hamcrest.Matchers.equalTo;

server/src/test/java/org/elasticsearch/cluster/service/TaskBatcherTests.java

@@ -26,7 +26,7 @@ import org.opensearch.cluster.metadata.ProcessClusterEventTimeoutException;
 import org.opensearch.common.Priority;
 import org.opensearch.common.collect.Tuple;
 import org.opensearch.common.unit.TimeValue;
-import org.opensearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor;
+import org.opensearch.common.util.concurrent.PrioritizedOpenSearchThreadPoolExecutor;
 import org.junit.Before;
 import org.opensearch.cluster.service.TaskBatcher;
 
@@ -61,7 +61,7 @@ public class TaskBatcherTests extends TaskExecutorTests {
 
     class TestTaskBatcher extends TaskBatcher {
 
-        TestTaskBatcher(Logger logger, PrioritizedEsThreadPoolExecutor threadExecutor) {
+        TestTaskBatcher(Logger logger, PrioritizedOpenSearchThreadPoolExecutor threadExecutor) {
             super(logger, threadExecutor);
         }
 

server/src/test/java/org/elasticsearch/cluster/service/TaskExecutorTests.java

@@ -26,7 +26,7 @@ import org.opensearch.common.lease.Releasable;
 import org.opensearch.common.settings.Settings;
 import org.opensearch.common.unit.TimeValue;
 import org.opensearch.common.util.concurrent.OpenSearchExecutors;
-import org.opensearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor;
+import org.opensearch.common.util.concurrent.PrioritizedOpenSearchThreadPoolExecutor;
 import org.opensearch.test.OpenSearchTestCase;
 import org.opensearch.cluster.service.SourcePrioritizedRunnable;
 import org.opensearch.threadpool.TestThreadPool;
@@ -50,7 +50,7 @@ import static org.hamcrest.core.Is.is;
 public class TaskExecutorTests extends OpenSearchTestCase {
 
     protected static ThreadPool threadPool;
-    protected PrioritizedEsThreadPoolExecutor threadExecutor;
+    protected PrioritizedOpenSearchThreadPoolExecutor threadExecutor;
 
     @BeforeClass
     public static void createThreadPool() {

server/src/test/java/org/elasticsearch/index/shard/IndexShardOperationPermitsTests.java

@@ -24,7 +24,7 @@ import org.opensearch.common.CheckedRunnable;
 import org.opensearch.common.lease.Releasable;
 import org.opensearch.common.settings.Settings;
 import org.opensearch.common.util.concurrent.OpenSearchRejectedExecutionException;
-import org.opensearch.common.util.concurrent.EsThreadPoolExecutor;
+import org.opensearch.common.util.concurrent.OpenSearchThreadPoolExecutor;
 import org.opensearch.common.util.concurrent.ThreadContext;
 import org.opensearch.test.OpenSearchTestCase;
 import org.opensearch.threadpool.TestThreadPool;
@@ -77,10 +77,10 @@ public class IndexShardOperationPermitsTests extends OpenSearchTestCase {
                 .put("thread_pool." + ThreadPool.Names.WRITE + ".size", writeThreadPoolSize)
                 .put("thread_pool." + ThreadPool.Names.WRITE + ".queue_size", writeThreadPoolQueueSize)
                 .build());
-        assertThat(threadPool.executor(ThreadPool.Names.WRITE), instanceOf(EsThreadPoolExecutor.class));
+        assertThat(threadPool.executor(ThreadPool.Names.WRITE), instanceOf(OpenSearchThreadPoolExecutor.class));
-        assertThat(((EsThreadPoolExecutor) threadPool.executor(ThreadPool.Names.WRITE)).getCorePoolSize(), equalTo(writeThreadPoolSize));
+        assertThat(((OpenSearchThreadPoolExecutor) threadPool.executor(ThreadPool.Names.WRITE)).getCorePoolSize(), equalTo(writeThreadPoolSize));
-        assertThat(((EsThreadPoolExecutor) threadPool.executor(ThreadPool.Names.WRITE)).getMaximumPoolSize(), equalTo(writeThreadPoolSize));
+        assertThat(((OpenSearchThreadPoolExecutor) threadPool.executor(ThreadPool.Names.WRITE)).getMaximumPoolSize(), equalTo(writeThreadPoolSize));
-        assertThat(((EsThreadPoolExecutor) threadPool.executor(ThreadPool.Names.WRITE)).getQueue().remainingCapacity(),
+        assertThat(((OpenSearchThreadPoolExecutor) threadPool.executor(ThreadPool.Names.WRITE)).getQueue().remainingCapacity(),
             equalTo(writeThreadPoolQueueSize));
     }
 

server/src/test/java/org/opensearch/action/search/QueryPhaseResultConsumerTests.java

@@ -28,7 +28,7 @@ import org.opensearch.common.breaker.NoopCircuitBreaker;
 import org.opensearch.common.lucene.search.TopDocsAndMaxScore;
 import org.opensearch.common.util.BigArrays;
 import org.opensearch.common.util.concurrent.OpenSearchExecutors;
-import org.opensearch.common.util.concurrent.EsThreadPoolExecutor;
+import org.opensearch.common.util.concurrent.OpenSearchThreadPoolExecutor;
 import org.opensearch.index.shard.ShardId;
 import org.opensearch.search.DocValueFormat;
 import org.opensearch.search.SearchShardTarget;
@@ -54,7 +54,7 @@ public class QueryPhaseResultConsumerTests extends OpenSearchTestCase {
 
     private SearchPhaseController searchPhaseController;
     private ThreadPool threadPool;
-    private EsThreadPoolExecutor executor;
+    private OpenSearchThreadPoolExecutor executor;
 
     @Before
     public void setup() {

server/src/test/java/org/opensearch/action/search/SearchPhaseControllerTests.java

@@ -44,7 +44,7 @@ import org.opensearch.common.text.Text;
 import org.opensearch.common.util.BigArrays;
 import org.opensearch.common.util.concurrent.AtomicArray;
 import org.opensearch.common.util.concurrent.OpenSearchExecutors;
-import org.opensearch.common.util.concurrent.EsThreadPoolExecutor;
+import org.opensearch.common.util.concurrent.OpenSearchThreadPoolExecutor;
 import org.opensearch.index.shard.ShardId;
 import org.opensearch.search.DocValueFormat;
 import org.opensearch.search.SearchHit;
@@ -102,7 +102,7 @@ import static org.hamcrest.Matchers.lessThanOrEqualTo;
 
 public class SearchPhaseControllerTests extends OpenSearchTestCase {
     private ThreadPool threadPool;
-    private EsThreadPoolExecutor fixedExecutor;
+    private OpenSearchThreadPoolExecutor fixedExecutor;
     private SearchPhaseController searchPhaseController;
     private List<Boolean> reductions;
 

server/src/test/java/org/opensearch/common/util/concurrent/OpenSearchExecutorsTests.java

@@ -51,7 +51,7 @@ public class OpenSearchExecutorsTests extends OpenSearchTestCase {
     }
 
     public void testFixedForcedExecution() throws Exception {
-        EsThreadPoolExecutor executor =
+        OpenSearchThreadPoolExecutor executor =
                 OpenSearchExecutors.newFixed(getName(), 1, 1, OpenSearchExecutors.daemonThreadFactory("test"), threadContext);
         final CountDownLatch wait = new CountDownLatch(1);
 
@@ -114,7 +114,7 @@ public class OpenSearchExecutorsTests extends OpenSearchTestCase {
     }
 
     public void testFixedRejected() throws Exception {
-        EsThreadPoolExecutor executor =
+        OpenSearchThreadPoolExecutor executor =
                 OpenSearchExecutors.newFixed(getName(), 1, 1, OpenSearchExecutors.daemonThreadFactory("test"), threadContext);
         final CountDownLatch wait = new CountDownLatch(1);
 
@@ -247,7 +247,7 @@ public class OpenSearchExecutorsTests extends OpenSearchTestCase {
         int queue = between(0, 100);
         int actions = queue + pool;
         final CountDownLatch latch = new CountDownLatch(1);
-        EsThreadPoolExecutor executor =
+        OpenSearchThreadPoolExecutor executor =
                 OpenSearchExecutors.newFixed(getName(), pool, queue, OpenSearchExecutors.daemonThreadFactory("dummy"), threadContext);
         try {
             for (int i = 0; i < actions; i++) {
@@ -279,7 +279,7 @@ public class OpenSearchExecutorsTests extends OpenSearchTestCase {
                 assertFalse("Thread pool registering as terminated when it isn't", e.isExecutorShutdown());
                 String message = e.getMessage();
                 assertThat(message, containsString("of dummy runnable"));
-                assertThat(message, containsString("on EsThreadPoolExecutor[name = " + getName()));
+                assertThat(message, containsString("on OpenSearchThreadPoolExecutor[name = " + getName()));
                 assertThat(message, containsString("queue capacity = " + queue));
                 assertThat(message, containsString("[Running"));
                 /*
@@ -319,7 +319,7 @@ public class OpenSearchExecutorsTests extends OpenSearchTestCase {
             assertTrue("Thread pool not registering as terminated when it is", e.isExecutorShutdown());
             String message = e.getMessage();
             assertThat(message, containsString("of dummy runnable"));
-            assertThat(message, containsString("on EsThreadPoolExecutor[name = " + getName()));
+            assertThat(message, containsString("on OpenSearchThreadPoolExecutor[name = " + getName()));
             assertThat(message, containsString("queue capacity = " + queue));
             assertThat(message, containsString("[Terminated"));
             assertThat(message, containsString("active threads = 0"));
@@ -337,7 +337,7 @@ public class OpenSearchExecutorsTests extends OpenSearchTestCase {
         threadContext.putHeader("foo", "bar");
         final Integer one = Integer.valueOf(1);
         threadContext.putTransient("foo", one);
-        EsThreadPoolExecutor executor =
+        OpenSearchThreadPoolExecutor executor =
                 OpenSearchExecutors.newFixed(getName(), pool, queue, OpenSearchExecutors.daemonThreadFactory("dummy"), threadContext);
         try {
             executor.execute(() -> {
@@ -368,7 +368,7 @@ public class OpenSearchExecutorsTests extends OpenSearchTestCase {
         int queue = between(0, 100);
         final CountDownLatch latch = new CountDownLatch(1);
         final CountDownLatch executed = new CountDownLatch(1);
-        EsThreadPoolExecutor executor =
+        OpenSearchThreadPoolExecutor executor =
                 OpenSearchExecutors.newFixed(getName(), pool, queue, OpenSearchExecutors.daemonThreadFactory("dummy"), threadContext);
         try {
             Runnable r = () -> {

server/src/test/java/org/opensearch/common/util/concurrent/PrioritizedExecutorsTests.java

@@ -190,7 +190,7 @@ public class PrioritizedExecutorsTests extends OpenSearchTestCase {
 
     public void testTimeout() throws Exception {
         ScheduledExecutorService timer = Executors.newSingleThreadScheduledExecutor(OpenSearchExecutors.daemonThreadFactory(getTestName()));
-        PrioritizedEsThreadPoolExecutor executor =
+        PrioritizedOpenSearchThreadPoolExecutor executor =
                 OpenSearchExecutors.newSinglePrioritizing(getName(), OpenSearchExecutors.daemonThreadFactory(getTestName()), holder, timer);
         final CountDownLatch invoked = new CountDownLatch(1);
         final CountDownLatch block = new CountDownLatch(1);
@@ -211,7 +211,7 @@ public class PrioritizedExecutorsTests extends OpenSearchTestCase {
             }
         });
         invoked.await();
-        PrioritizedEsThreadPoolExecutor.Pending[] pending = executor.getPending();
+        PrioritizedOpenSearchThreadPoolExecutor.Pending[] pending = executor.getPending();
         assertThat(pending.length, equalTo(1));
         assertThat(pending[0].task.toString(), equalTo("the blocking"));
         assertThat(pending[0].executing, equalTo(true));
@@ -254,7 +254,7 @@ public class PrioritizedExecutorsTests extends OpenSearchTestCase {
         ThreadPool threadPool = new TestThreadPool("test");
         final ScheduledThreadPoolExecutor timer = (ScheduledThreadPoolExecutor) threadPool.scheduler();
         final AtomicBoolean timeoutCalled = new AtomicBoolean();
-        PrioritizedEsThreadPoolExecutor executor =
+        PrioritizedOpenSearchThreadPoolExecutor executor =
                 OpenSearchExecutors.newSinglePrioritizing(getName(), OpenSearchExecutors.daemonThreadFactory(getTestName()), holder, timer);
         final CountDownLatch invoked = new CountDownLatch(1);
         executor.execute(new Runnable() {

server/src/test/java/org/opensearch/common/util/concurrent/QueueResizingOpenSearchThreadPoolExecutorTests.java

@@ -44,8 +44,8 @@ public class QueueResizingOpenSearchThreadPoolExecutorTests extends OpenSearchTe
         int threads = randomIntBetween(1, 3);
         int measureWindow = 3;
         logger.info("--> auto-queue with a measurement window of {} tasks", measureWindow);
-        QueueResizingEsThreadPoolExecutor executor =
+        QueueResizingOpenSearchThreadPoolExecutor executor =
-                new QueueResizingEsThreadPoolExecutor(
+                new QueueResizingOpenSearchThreadPoolExecutor(
                         "test-threadpool", threads, threads, 1000,
                         TimeUnit.MILLISECONDS, queue, 10, 1000, fastWrapper(),
                         measureWindow, TimeValue.timeValueMillis(1), OpenSearchExecutors.daemonThreadFactory("queuetest"),
@@ -75,8 +75,8 @@ public class QueueResizingOpenSearchThreadPoolExecutorTests extends OpenSearchTe
         int threads = randomIntBetween(1, 10);
         int measureWindow = randomIntBetween(100, 200);
         logger.info("--> auto-queue with a measurement window of {} tasks", measureWindow);
-        QueueResizingEsThreadPoolExecutor executor =
+        QueueResizingOpenSearchThreadPoolExecutor executor =
-                new QueueResizingEsThreadPoolExecutor(
+                new QueueResizingOpenSearchThreadPoolExecutor(
                         "test-threadpool", threads, threads, 1000,
                         TimeUnit.MILLISECONDS, queue, 10, 3000, fastWrapper(),
                         measureWindow, TimeValue.timeValueMillis(1), OpenSearchExecutors.daemonThreadFactory("queuetest"),
@@ -103,8 +103,8 @@ public class QueueResizingOpenSearchThreadPoolExecutorTests extends OpenSearchTe
         int threads = randomIntBetween(1, 10);
         int measureWindow = randomIntBetween(100, 200);
         logger.info("--> auto-queue with a measurement window of {} tasks", measureWindow);
-        QueueResizingEsThreadPoolExecutor executor =
+        QueueResizingOpenSearchThreadPoolExecutor executor =
-                new QueueResizingEsThreadPoolExecutor(
+                new QueueResizingOpenSearchThreadPoolExecutor(
                         "test-threadpool", threads, threads, 1000,
                         TimeUnit.MILLISECONDS, queue, 10, 3000, slowWrapper(), measureWindow, TimeValue.timeValueMillis(1),
                         OpenSearchExecutors.daemonThreadFactory("queuetest"), new OpenSearchAbortPolicy(), context);
@@ -131,8 +131,8 @@ public class QueueResizingOpenSearchThreadPoolExecutorTests extends OpenSearchTe
         int measureWindow = randomIntBetween(10, 100);
         int min = randomIntBetween(4981, 4999);
         logger.info("--> auto-queue with a measurement window of {} tasks", measureWindow);
-        QueueResizingEsThreadPoolExecutor executor =
+        QueueResizingOpenSearchThreadPoolExecutor executor =
-                new QueueResizingEsThreadPoolExecutor(
+                new QueueResizingOpenSearchThreadPoolExecutor(
                         "test-threadpool", threads, threads, 1000,
                         TimeUnit.MILLISECONDS, queue, min, 100000, slowWrapper(), measureWindow, TimeValue.timeValueMillis(1),
                         OpenSearchExecutors.daemonThreadFactory("queuetest"), new OpenSearchAbortPolicy(), context);
@@ -160,8 +160,8 @@ public class QueueResizingOpenSearchThreadPoolExecutorTests extends OpenSearchTe
         int measureWindow = randomIntBetween(10, 100);
         int max = randomIntBetween(5010, 5024);
         logger.info("--> auto-queue with a measurement window of {} tasks", measureWindow);
-        QueueResizingEsThreadPoolExecutor executor =
+        QueueResizingOpenSearchThreadPoolExecutor executor =
-                new QueueResizingEsThreadPoolExecutor(
+                new QueueResizingOpenSearchThreadPoolExecutor(
                         "test-threadpool", threads, threads, 1000,
                         TimeUnit.MILLISECONDS, queue, 10, max, fastWrapper(), measureWindow, TimeValue.timeValueMillis(1),
                         OpenSearchExecutors.daemonThreadFactory("queuetest"), new OpenSearchAbortPolicy(), context);
@@ -185,8 +185,8 @@ public class QueueResizingOpenSearchThreadPoolExecutorTests extends OpenSearchTe
                 new ResizableBlockingQueue<>(ConcurrentCollections.<Runnable>newBlockingQueue(),
                         100);
 
-        QueueResizingEsThreadPoolExecutor executor =
+        QueueResizingOpenSearchThreadPoolExecutor executor =
-                new QueueResizingEsThreadPoolExecutor(
+                new QueueResizingOpenSearchThreadPoolExecutor(
                         "test-threadpool", 1, 1, 1000,
                         TimeUnit.MILLISECONDS, queue, 10, 200, fastWrapper(), 10, TimeValue.timeValueMillis(1),
                         OpenSearchExecutors.daemonThreadFactory("queuetest"), new OpenSearchAbortPolicy(), context);
@@ -226,8 +226,8 @@ public class QueueResizingOpenSearchThreadPoolExecutorTests extends OpenSearchTe
             new ResizableBlockingQueue<>(ConcurrentCollections.<Runnable>newBlockingQueue(),
                 100);
 
-        QueueResizingEsThreadPoolExecutor executor =
+        QueueResizingOpenSearchThreadPoolExecutor executor =
-            new QueueResizingEsThreadPoolExecutor(
+            new QueueResizingOpenSearchThreadPoolExecutor(
                 "test-threadpool", 1, 1, 1000,
                 TimeUnit.MILLISECONDS, queue, 10, 200, exceptionalWrapper(), 10, TimeValue.timeValueMillis(1),
                 OpenSearchExecutors.daemonThreadFactory("queuetest"), new OpenSearchAbortPolicy(), context);
@@ -258,7 +258,7 @@ public class QueueResizingOpenSearchThreadPoolExecutorTests extends OpenSearchTe
     }
 
     /** Execute a blank task {@code times} times for the executor */
-    private void executeTask(QueueResizingEsThreadPoolExecutor executor, int times) {
+    private void executeTask(QueueResizingOpenSearchThreadPoolExecutor executor, int times) {
         logger.info("--> executing a task [{}] times", times);
         for (int i = 0; i < times; i++) {
             executor.execute(() -> {});

server/src/test/java/org/opensearch/snapshots/SnapshotResiliencyTests.java

@@ -144,7 +144,7 @@ import org.opensearch.common.transport.TransportAddress;
 import org.opensearch.common.util.BigArrays;
 import org.elasticsearch.common.util.PageCacheRecycler;
 import org.opensearch.common.util.concurrent.AbstractRunnable;
-import org.opensearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor;
+import org.opensearch.common.util.concurrent.PrioritizedOpenSearchThreadPoolExecutor;
 import org.opensearch.common.util.concurrent.ThreadContext;
 import org.opensearch.common.xcontent.NamedXContentRegistry;
 import org.opensearch.env.Environment;
@@ -1414,7 +1414,7 @@ public class SnapshotResiliencyTests extends OpenSearchTestCase {
                 clusterService = new ClusterService(settings, clusterSettings, masterService,
                     new ClusterApplierService(node.getName(), settings, clusterSettings, threadPool) {
                         @Override
-                        protected PrioritizedEsThreadPoolExecutor createThreadPoolExecutor() {
+                        protected PrioritizedOpenSearchThreadPoolExecutor createThreadPoolExecutor() {
                             return new MockSinglePrioritizingExecutor(node.getName(), deterministicTaskQueue, threadPool);
                         }
 

server/src/test/java/org/opensearch/threadpool/ScalingThreadPoolTests.java

@@ -21,7 +21,7 @@ package org.opensearch.threadpool;
 
 import org.opensearch.common.settings.ClusterSettings;
 import org.opensearch.common.settings.Settings;
-import org.opensearch.common.util.concurrent.EsThreadPoolExecutor;
+import org.opensearch.common.util.concurrent.OpenSearchThreadPoolExecutor;
 
 import java.util.HashMap;
 import java.util.Map;
@@ -79,23 +79,23 @@ public class ScalingThreadPoolTests extends OpenSearchThreadPoolTestCase {
 
         runScalingThreadPoolTest(builder.build(), (clusterSettings, threadPool) -> {
             final Executor executor = threadPool.executor(threadPoolName);
-            assertThat(executor, instanceOf(EsThreadPoolExecutor.class));
+            assertThat(executor, instanceOf(OpenSearchThreadPoolExecutor.class));
-            final EsThreadPoolExecutor esThreadPoolExecutor = (EsThreadPoolExecutor)executor;
+            final OpenSearchThreadPoolExecutor openSearchThreadPoolExecutor = (OpenSearchThreadPoolExecutor)executor;
             final ThreadPool.Info info = info(threadPool, threadPoolName);
 
             assertThat(info.getName(), equalTo(threadPoolName));
             assertThat(info.getThreadPoolType(), equalTo(ThreadPool.ThreadPoolType.SCALING));
 
             assertThat(info.getKeepAlive().seconds(), equalTo(keepAlive));
-            assertThat(esThreadPoolExecutor.getKeepAliveTime(TimeUnit.SECONDS), equalTo(keepAlive));
+            assertThat(openSearchThreadPoolExecutor.getKeepAliveTime(TimeUnit.SECONDS), equalTo(keepAlive));
 
             assertNull(info.getQueueSize());
-            assertThat(esThreadPoolExecutor.getQueue().remainingCapacity(), equalTo(Integer.MAX_VALUE));
+            assertThat(openSearchThreadPoolExecutor.getQueue().remainingCapacity(), equalTo(Integer.MAX_VALUE));
 
             assertThat(info.getMin(), equalTo(core));
-            assertThat(esThreadPoolExecutor.getCorePoolSize(), equalTo(core));
+            assertThat(openSearchThreadPoolExecutor.getCorePoolSize(), equalTo(core));
             assertThat(info.getMax(), equalTo(expectedMax));
-            assertThat(esThreadPoolExecutor.getMaximumPoolSize(), equalTo(expectedMax));
+            assertThat(openSearchThreadPoolExecutor.getMaximumPoolSize(), equalTo(expectedMax));
         });
 
         if (processorsUsed > availableProcessors) {

server/src/test/java/org/opensearch/threadpool/UpdateThreadPoolSettingsTests.java

@@ -22,7 +22,7 @@ package org.opensearch.threadpool;
 import org.opensearch.common.settings.Settings;
 import org.opensearch.common.unit.TimeValue;
 import org.opensearch.common.util.concurrent.OpenSearchExecutors;
-import org.opensearch.common.util.concurrent.EsThreadPoolExecutor;
+import org.opensearch.common.util.concurrent.OpenSearchThreadPoolExecutor;
 import org.opensearch.threadpool.ThreadPool.Names;
 
 import java.lang.reflect.Field;
@@ -105,16 +105,16 @@ public class UpdateThreadPoolSettingsTests extends OpenSearchThreadPoolTestCase
                 .put("thread_pool." + threadPoolName + ".size", expectedSize)
                 .build();
             threadPool = new ThreadPool(nodeSettings);
-            assertThat(threadPool.executor(threadPoolName), instanceOf(EsThreadPoolExecutor.class));
+            assertThat(threadPool.executor(threadPoolName), instanceOf(OpenSearchThreadPoolExecutor.class));
 
             assertEquals(info(threadPool, threadPoolName).getThreadPoolType(), ThreadPool.ThreadPoolType.FIXED);
-            assertThat(threadPool.executor(threadPoolName), instanceOf(EsThreadPoolExecutor.class));
+            assertThat(threadPool.executor(threadPoolName), instanceOf(OpenSearchThreadPoolExecutor.class));
-            assertThat(((EsThreadPoolExecutor) threadPool.executor(threadPoolName)).getCorePoolSize(), equalTo(expectedSize));
+            assertThat(((OpenSearchThreadPoolExecutor) threadPool.executor(threadPoolName)).getCorePoolSize(), equalTo(expectedSize));
-            assertThat(((EsThreadPoolExecutor) threadPool.executor(threadPoolName)).getMaximumPoolSize(), equalTo(expectedSize));
+            assertThat(((OpenSearchThreadPoolExecutor) threadPool.executor(threadPoolName)).getMaximumPoolSize(), equalTo(expectedSize));
             assertThat(info(threadPool, threadPoolName).getMin(), equalTo(expectedSize));
             assertThat(info(threadPool, threadPoolName).getMax(), equalTo(expectedSize));
             // keep alive does not apply to fixed thread pools
-            assertThat(((EsThreadPoolExecutor) threadPool.executor(threadPoolName)).getKeepAliveTime(TimeUnit.MINUTES), equalTo(0L));
+            assertThat(((OpenSearchThreadPoolExecutor) threadPool.executor(threadPoolName)).getKeepAliveTime(TimeUnit.MINUTES), equalTo(0L));
         } finally {
             terminateThreadPoolIfNeeded(threadPool);
         }
@@ -139,7 +139,7 @@ public class UpdateThreadPoolSettingsTests extends OpenSearchThreadPoolTestCase
             final long expectedKeepAlive = "generic".equals(threadPoolName) ? 30 : 300;
             assertThat(info(threadPool, threadPoolName).getKeepAlive().seconds(), equalTo(expectedKeepAlive));
             assertEquals(info(threadPool, threadPoolName).getThreadPoolType(), ThreadPool.ThreadPoolType.SCALING);
-            assertThat(threadPool.executor(threadPoolName), instanceOf(EsThreadPoolExecutor.class));
+            assertThat(threadPool.executor(threadPoolName), instanceOf(OpenSearchThreadPoolExecutor.class));
         } finally {
             terminateThreadPoolIfNeeded(threadPool);
         }

test/framework/src/main/java/org/opensearch/cluster/coordination/AbstractCoordinatorTestCase.java

@@ -59,7 +59,7 @@ import org.opensearch.common.unit.TimeValue;
 import org.opensearch.common.util.BigArrays;
 import org.opensearch.common.util.MockBigArrays;
 import org.opensearch.common.util.MockPageCacheRecycler;
-import org.opensearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor;
+import org.opensearch.common.util.concurrent.PrioritizedOpenSearchThreadPoolExecutor;
 import org.opensearch.discovery.DiscoveryModule;
 import org.opensearch.discovery.SeedHostsProvider;
 import org.opensearch.env.NodeEnvironment;
@@ -1366,7 +1366,7 @@ public class AbstractCoordinatorTestCase extends OpenSearchTestCase {
         }
 
         @Override
-        protected PrioritizedEsThreadPoolExecutor createThreadPoolExecutor() {
+        protected PrioritizedOpenSearchThreadPoolExecutor createThreadPoolExecutor() {
             return new MockSinglePrioritizingExecutor(nodeName, deterministicTaskQueue, threadPool);
         }
 

test/framework/src/main/java/org/opensearch/cluster/coordination/MockSinglePrioritizingExecutor.java

@@ -19,16 +19,16 @@
 package org.opensearch.cluster.coordination;
 
 import org.opensearch.common.util.concurrent.OpenSearchExecutors;
-import org.opensearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor;
+import org.opensearch.common.util.concurrent.PrioritizedOpenSearchThreadPoolExecutor;
 import org.opensearch.threadpool.ThreadPool;
 
 import java.util.concurrent.TimeUnit;
 
 /**
- * Mock single threaded {@link PrioritizedEsThreadPoolExecutor} based on {@link DeterministicTaskQueue},
+ * Mock single threaded {@link PrioritizedOpenSearchThreadPoolExecutor} based on {@link DeterministicTaskQueue},
  * simulating the behaviour of an executor returned by {@link OpenSearchExecutors#newSinglePrioritizing}.
  */
-public class MockSinglePrioritizingExecutor extends PrioritizedEsThreadPoolExecutor {
+public class MockSinglePrioritizingExecutor extends PrioritizedOpenSearchThreadPoolExecutor {
 
     public MockSinglePrioritizingExecutor(String name, DeterministicTaskQueue deterministicTaskQueue, ThreadPool threadPool) {
         super(name, 0, 1, 0L, TimeUnit.MILLISECONDS,

test/framework/src/main/java/org/opensearch/cluster/service/FakeThreadPoolMasterService.java

@@ -29,7 +29,7 @@ import org.opensearch.common.settings.ClusterSettings;
 import org.opensearch.common.settings.Settings;
 import org.opensearch.common.unit.TimeValue;
 import org.opensearch.common.util.concurrent.OpenSearchExecutors;
-import org.opensearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor;
+import org.opensearch.common.util.concurrent.PrioritizedOpenSearchThreadPoolExecutor;
 import org.opensearch.common.util.concurrent.ThreadContext;
 import org.opensearch.node.Node;
 import org.opensearch.threadpool.ThreadPool;
@@ -61,8 +61,8 @@ public class FakeThreadPoolMasterService extends MasterService {
     }
 
     @Override
-    protected PrioritizedEsThreadPoolExecutor createThreadPoolExecutor() {
+    protected PrioritizedOpenSearchThreadPoolExecutor createThreadPoolExecutor() {
-        return new PrioritizedEsThreadPoolExecutor(name, 1, 1, 1, TimeUnit.SECONDS, OpenSearchExecutors.daemonThreadFactory(name),
+        return new PrioritizedOpenSearchThreadPoolExecutor(name, 1, 1, 1, TimeUnit.SECONDS, OpenSearchExecutors.daemonThreadFactory(name),
             null, null) {
 
             @Override

test/framework/src/main/java/org/opensearch/common/lucene/store/OpenSearchIndexInputTestCase.java

@@ -24,7 +24,7 @@ import org.opensearch.action.support.PlainActionFuture;
 import org.opensearch.common.settings.Settings;
 import org.opensearch.common.util.concurrent.AbstractRunnable;
 import org.opensearch.common.util.concurrent.OpenSearchExecutors;
-import org.opensearch.common.util.concurrent.EsThreadPoolExecutor;
+import org.opensearch.common.util.concurrent.OpenSearchThreadPoolExecutor;
 import org.opensearch.common.util.concurrent.ThreadContext;
 import org.opensearch.test.OpenSearchTestCase;
 import org.junit.AfterClass;
@@ -38,7 +38,7 @@ import java.util.concurrent.CountDownLatch;
  */
 public class OpenSearchIndexInputTestCase extends OpenSearchTestCase {
 
-    private static EsThreadPoolExecutor executor;
+    private static OpenSearchThreadPoolExecutor executor;
 
     @BeforeClass
     public static void createExecutor() {

test/framework/src/main/java/org/opensearch/test/OpenSearchIntegTestCase.java

@@ -1856,7 +1856,7 @@ public abstract class OpenSearchIntegTestCase extends OpenSearchTestCase {
             .putList(DISCOVERY_SEED_PROVIDERS_SETTING.getKey(), "file");
         if (rarely()) {
             // Sometimes adjust the minimum search thread pool size, causing
-            // QueueResizingEsThreadPoolExecutor to be used instead of a regular
+            // QueueResizingOpenSearchThreadPoolExecutor to be used instead of a regular
             // fixed thread pool
             builder.put("thread_pool.search.min_queue_size", 100);
         }

test/framework/src/test/java/org/opensearch/cluster/coordination/MockSinglePrioritizingExecutorTests.java

@@ -19,7 +19,7 @@
 package org.opensearch.cluster.coordination;
 
 import org.opensearch.common.Priority;
-import org.opensearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor;
+import org.opensearch.common.util.concurrent.PrioritizedOpenSearchThreadPoolExecutor;
 import org.opensearch.common.util.concurrent.PrioritizedRunnable;
 import org.opensearch.test.OpenSearchTestCase;
 
@@ -29,7 +29,7 @@ public class MockSinglePrioritizingExecutorTests extends OpenSearchTestCase {
 
     public void testPrioritizedEsThreadPoolExecutor() {
         final DeterministicTaskQueue taskQueue = DeterministicTaskQueueTests.newTaskQueue();
-        final PrioritizedEsThreadPoolExecutor executor = new MockSinglePrioritizingExecutor("test", taskQueue, taskQueue.getThreadPool());
+        final PrioritizedOpenSearchThreadPoolExecutor executor = new MockSinglePrioritizingExecutor("test", taskQueue, taskQueue.getThreadPool());
         final AtomicBoolean called1 = new AtomicBoolean();
         final AtomicBoolean called2 = new AtomicBoolean();
         executor.execute(new PrioritizedRunnable(Priority.NORMAL) {