diff --git a/server/src/main/java/org/elasticsearch/gateway/AsyncShardFetch.java b/server/src/main/java/org/opensearch/gateway/AsyncShardFetch.java
similarity index 96%
rename from server/src/main/java/org/elasticsearch/gateway/AsyncShardFetch.java
rename to server/src/main/java/org/opensearch/gateway/AsyncShardFetch.java
index 89e49789fd3..ef3b584ae1c 100644
--- a/server/src/main/java/org/elasticsearch/gateway/AsyncShardFetch.java
+++ b/server/src/main/java/org/opensearch/gateway/AsyncShardFetch.java
@@ -16,25 +16,25 @@
  * specific language governing permissions and limitations
  * under the License.
  */
-package org.elasticsearch.gateway;
+package org.opensearch.gateway;
 
 import com.carrotsearch.hppc.cursors.ObjectObjectCursor;
 import org.apache.logging.log4j.Logger;
 import org.apache.logging.log4j.message.ParameterizedMessage;
-import org.elasticsearch.OpenSearchTimeoutException;
-import org.elasticsearch.ExceptionsHelper;
+import org.opensearch.OpenSearchTimeoutException;
+import org.opensearch.ExceptionsHelper;
 import org.opensearch.action.ActionListener;
 import org.opensearch.action.FailedNodeException;
-import org.elasticsearch.action.support.nodes.BaseNodeResponse;
-import org.elasticsearch.action.support.nodes.BaseNodesResponse;
-import org.elasticsearch.cluster.node.DiscoveryNode;
-import org.elasticsearch.cluster.node.DiscoveryNodes;
-import org.elasticsearch.cluster.routing.allocation.RoutingAllocation;
-import org.elasticsearch.common.Nullable;
-import org.elasticsearch.common.lease.Releasable;
-import org.elasticsearch.common.util.concurrent.EsRejectedExecutionException;
-import org.elasticsearch.index.shard.ShardId;
-import org.elasticsearch.transport.ReceiveTimeoutTransportException;
+import org.opensearch.action.support.nodes.BaseNodeResponse;
+import org.opensearch.action.support.nodes.BaseNodesResponse;
+import org.opensearch.cluster.node.DiscoveryNode;
+import org.opensearch.cluster.node.DiscoveryNodes;
+import org.opensearch.cluster.routing.allocation.RoutingAllocation;
+import org.opensearch.common.Nullable;
+import org.opensearch.common.lease.Releasable;
+import org.opensearch.common.util.concurrent.EsRejectedExecutionException;
+import org.opensearch.index.shard.ShardId;
+import org.opensearch.transport.ReceiveTimeoutTransportException;
 
 import java.util.ArrayList;
 import java.util.HashMap;
diff --git a/server/src/main/java/org/elasticsearch/gateway/BaseGatewayShardAllocator.java b/server/src/main/java/org/opensearch/gateway/BaseGatewayShardAllocator.java
similarity index 88%
rename from server/src/main/java/org/elasticsearch/gateway/BaseGatewayShardAllocator.java
rename to server/src/main/java/org/opensearch/gateway/BaseGatewayShardAllocator.java
index 103292913e7..5fe52f823d8 100644
--- a/server/src/main/java/org/elasticsearch/gateway/BaseGatewayShardAllocator.java
+++ b/server/src/main/java/org/opensearch/gateway/BaseGatewayShardAllocator.java
@@ -17,19 +17,19 @@
  * under the License.
  */
 
-package org.elasticsearch.gateway;
+package org.opensearch.gateway;
 
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
-import org.elasticsearch.cluster.routing.RecoverySource;
-import org.elasticsearch.cluster.routing.RoutingNode;
-import org.elasticsearch.cluster.routing.ShardRouting;
-import org.elasticsearch.cluster.routing.allocation.AllocateUnassignedDecision;
-import org.elasticsearch.cluster.routing.allocation.AllocationDecision;
-import org.elasticsearch.cluster.routing.allocation.ExistingShardsAllocator;
-import org.elasticsearch.cluster.routing.allocation.NodeAllocationResult;
-import org.elasticsearch.cluster.routing.allocation.RoutingAllocation;
-import org.elasticsearch.cluster.routing.allocation.decider.Decision;
+import org.opensearch.cluster.routing.RecoverySource;
+import org.opensearch.cluster.routing.RoutingNode;
+import org.opensearch.cluster.routing.ShardRouting;
+import org.opensearch.cluster.routing.allocation.AllocateUnassignedDecision;
+import org.opensearch.cluster.routing.allocation.AllocationDecision;
+import org.opensearch.cluster.routing.allocation.ExistingShardsAllocator;
+import org.opensearch.cluster.routing.allocation.NodeAllocationResult;
+import org.opensearch.cluster.routing.allocation.RoutingAllocation;
+import org.opensearch.cluster.routing.allocation.decider.Decision;
 
 import java.util.ArrayList;
 import java.util.List;
diff --git a/server/src/main/java/org/elasticsearch/gateway/ClusterStateUpdaters.java b/server/src/main/java/org/opensearch/gateway/ClusterStateUpdaters.java
similarity index 94%
rename from server/src/main/java/org/elasticsearch/gateway/ClusterStateUpdaters.java
rename to server/src/main/java/org/opensearch/gateway/ClusterStateUpdaters.java
index ececd700410..9b9772915d3 100644
--- a/server/src/main/java/org/elasticsearch/gateway/ClusterStateUpdaters.java
+++ b/server/src/main/java/org/opensearch/gateway/ClusterStateUpdaters.java
@@ -17,7 +17,7 @@
  * under the License.
  */
 
-package org.elasticsearch.gateway;
+package org.opensearch.gateway;
 
 import com.carrotsearch.hppc.cursors.ObjectCursor;
 import org.apache.logging.log4j.LogManager;
@@ -25,16 +25,16 @@ import org.apache.logging.log4j.Logger;
 import org.apache.logging.log4j.message.ParameterizedMessage;
 import org.opensearch.cluster.ClusterState;
 import org.opensearch.cluster.block.ClusterBlocks;
-import org.elasticsearch.cluster.metadata.IndexMetadata;
-import org.elasticsearch.cluster.metadata.Metadata;
-import org.elasticsearch.cluster.node.DiscoveryNode;
-import org.elasticsearch.cluster.node.DiscoveryNodes;
-import org.elasticsearch.cluster.routing.RoutingTable;
-import org.elasticsearch.common.settings.ClusterSettings;
+import org.opensearch.cluster.metadata.IndexMetadata;
+import org.opensearch.cluster.metadata.Metadata;
+import org.opensearch.cluster.node.DiscoveryNode;
+import org.opensearch.cluster.node.DiscoveryNodes;
+import org.opensearch.cluster.routing.RoutingTable;
+import org.opensearch.common.settings.ClusterSettings;
 
 import java.util.Map;
 
-import static org.elasticsearch.gateway.GatewayService.STATE_NOT_RECOVERED_BLOCK;
+import static org.opensearch.gateway.GatewayService.STATE_NOT_RECOVERED_BLOCK;
 
 public class ClusterStateUpdaters {
     private static final Logger logger = LogManager.getLogger(ClusterStateUpdaters.class);
diff --git a/server/src/main/java/org/elasticsearch/gateway/CorruptStateException.java b/server/src/main/java/org/opensearch/gateway/CorruptStateException.java
similarity index 91%
rename from server/src/main/java/org/elasticsearch/gateway/CorruptStateException.java
rename to server/src/main/java/org/opensearch/gateway/CorruptStateException.java
index b8aca8be2f5..ede21ac996e 100644
--- a/server/src/main/java/org/elasticsearch/gateway/CorruptStateException.java
+++ b/server/src/main/java/org/opensearch/gateway/CorruptStateException.java
@@ -16,12 +16,12 @@
  * specific language governing permissions and limitations
  * under the License.
  */
-package org.elasticsearch.gateway;
+package org.opensearch.gateway;
 
-import org.elasticsearch.OpenSearchCorruptionException;
+import org.opensearch.OpenSearchCorruptionException;
 
 /**
- * This exception is thrown when Elasticsearch detects
+ * This exception is thrown when OpenSearch detects
  * an inconsistency in one of it's persistent states.
  */
 public class CorruptStateException extends OpenSearchCorruptionException {
diff --git a/server/src/main/java/org/elasticsearch/gateway/DanglingIndicesState.java b/server/src/main/java/org/opensearch/gateway/DanglingIndicesState.java
similarity index 95%
rename from server/src/main/java/org/elasticsearch/gateway/DanglingIndicesState.java
rename to server/src/main/java/org/opensearch/gateway/DanglingIndicesState.java
index f8bac084bff..fccd377ed44 100644
--- a/server/src/main/java/org/elasticsearch/gateway/DanglingIndicesState.java
+++ b/server/src/main/java/org/opensearch/gateway/DanglingIndicesState.java
@@ -17,7 +17,7 @@
  * under the License.
  */
 
-package org.elasticsearch.gateway;
+package org.opensearch.gateway;
 
 import com.carrotsearch.hppc.cursors.ObjectCursor;
 import org.apache.logging.log4j.LogManager;
@@ -25,15 +25,15 @@ import org.apache.logging.log4j.Logger;
 import org.opensearch.action.ActionListener;
 import org.opensearch.cluster.ClusterChangedEvent;
 import org.opensearch.cluster.ClusterStateListener;
-import org.elasticsearch.cluster.metadata.IndexGraveyard;
-import org.elasticsearch.cluster.metadata.IndexMetadata;
-import org.elasticsearch.cluster.metadata.Metadata;
-import org.elasticsearch.cluster.service.ClusterService;
-import org.elasticsearch.common.inject.Inject;
-import org.elasticsearch.common.settings.Setting;
-import org.elasticsearch.common.util.concurrent.ConcurrentCollections;
-import org.elasticsearch.env.NodeEnvironment;
-import org.elasticsearch.index.Index;
+import org.opensearch.cluster.metadata.IndexGraveyard;
+import org.opensearch.cluster.metadata.IndexMetadata;
+import org.opensearch.cluster.metadata.Metadata;
+import org.opensearch.cluster.service.ClusterService;
+import org.opensearch.common.inject.Inject;
+import org.opensearch.common.settings.Setting;
+import org.opensearch.common.util.concurrent.ConcurrentCollections;
+import org.opensearch.env.NodeEnvironment;
+import org.opensearch.index.Index;
 
 import java.io.IOException;
 import java.util.ArrayList;
@@ -60,7 +60,7 @@ public class DanglingIndicesState implements ClusterStateListener {
      * state upon discovery. This setting is deprecated - use the <code>_dangling</code> API instead.
      * If disabled, dangling indices will not be automatically detected.
      *
-     * @see org.elasticsearch.action.admin.indices.dangling
+     * @see org.opensearch.action.admin.indices.dangling
      */
     public static final Setting<Boolean> AUTO_IMPORT_DANGLING_INDICES_SETTING = Setting.boolSetting(
         "gateway.auto_import_dangling_indices",
diff --git a/server/src/main/java/org/elasticsearch/gateway/Gateway.java b/server/src/main/java/org/opensearch/gateway/Gateway.java
similarity index 94%
rename from server/src/main/java/org/elasticsearch/gateway/Gateway.java
rename to server/src/main/java/org/opensearch/gateway/Gateway.java
index 4cd468366fb..f809adc2519 100644
--- a/server/src/main/java/org/elasticsearch/gateway/Gateway.java
+++ b/server/src/main/java/org/opensearch/gateway/Gateway.java
@@ -17,7 +17,7 @@
  * under the License.
  */
 
-package org.elasticsearch.gateway;
+package org.opensearch.gateway;
 
 import com.carrotsearch.hppc.ObjectFloatHashMap;
 import com.carrotsearch.hppc.cursors.ObjectCursor;
@@ -25,12 +25,12 @@ import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.opensearch.action.FailedNodeException;
 import org.opensearch.cluster.ClusterState;
-import org.elasticsearch.cluster.metadata.IndexMetadata;
-import org.elasticsearch.cluster.metadata.Metadata;
-import org.elasticsearch.cluster.service.ClusterService;
-import org.elasticsearch.common.settings.Settings;
-import org.elasticsearch.discovery.zen.ElectMasterService;
-import org.elasticsearch.index.Index;
+import org.opensearch.cluster.metadata.IndexMetadata;
+import org.opensearch.cluster.metadata.Metadata;
+import org.opensearch.cluster.service.ClusterService;
+import org.opensearch.common.settings.Settings;
+import org.opensearch.discovery.zen.ElectMasterService;
+import org.opensearch.index.Index;
 
 import java.util.Arrays;
 import java.util.function.Function;
diff --git a/server/src/main/java/org/elasticsearch/gateway/GatewayAllocator.java b/server/src/main/java/org/opensearch/gateway/GatewayAllocator.java
similarity index 91%
rename from server/src/main/java/org/elasticsearch/gateway/GatewayAllocator.java
rename to server/src/main/java/org/opensearch/gateway/GatewayAllocator.java
index 917cb985831..6314d02ff0a 100644
--- a/server/src/main/java/org/elasticsearch/gateway/GatewayAllocator.java
+++ b/server/src/main/java/org/opensearch/gateway/GatewayAllocator.java
@@ -17,31 +17,31 @@
  * under the License.
  */
 
-package org.elasticsearch.gateway;
+package org.opensearch.gateway;
 
 import com.carrotsearch.hppc.cursors.ObjectObjectCursor;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.apache.logging.log4j.message.ParameterizedMessage;
 import org.opensearch.action.ActionListener;
-import org.elasticsearch.action.support.nodes.BaseNodeResponse;
-import org.elasticsearch.action.support.nodes.BaseNodesResponse;
-import org.elasticsearch.cluster.metadata.IndexMetadata;
-import org.elasticsearch.cluster.node.DiscoveryNode;
-import org.elasticsearch.cluster.node.DiscoveryNodes;
-import org.elasticsearch.cluster.routing.RerouteService;
-import org.elasticsearch.cluster.routing.ShardRouting;
-import org.elasticsearch.cluster.routing.allocation.AllocateUnassignedDecision;
-import org.elasticsearch.cluster.routing.allocation.ExistingShardsAllocator;
-import org.elasticsearch.cluster.routing.allocation.FailedShard;
-import org.elasticsearch.cluster.routing.allocation.RoutingAllocation;
-import org.elasticsearch.common.Priority;
-import org.elasticsearch.common.inject.Inject;
-import org.elasticsearch.common.lease.Releasables;
-import org.elasticsearch.common.util.concurrent.ConcurrentCollections;
-import org.elasticsearch.common.util.set.Sets;
-import org.elasticsearch.index.shard.ShardId;
-import org.elasticsearch.indices.store.TransportNodesListShardStoreMetadata;
+import org.opensearch.action.support.nodes.BaseNodeResponse;
+import org.opensearch.action.support.nodes.BaseNodesResponse;
+import org.opensearch.cluster.metadata.IndexMetadata;
+import org.opensearch.cluster.node.DiscoveryNode;
+import org.opensearch.cluster.node.DiscoveryNodes;
+import org.opensearch.cluster.routing.RerouteService;
+import org.opensearch.cluster.routing.ShardRouting;
+import org.opensearch.cluster.routing.allocation.AllocateUnassignedDecision;
+import org.opensearch.cluster.routing.allocation.ExistingShardsAllocator;
+import org.opensearch.cluster.routing.allocation.FailedShard;
+import org.opensearch.cluster.routing.allocation.RoutingAllocation;
+import org.opensearch.common.Priority;
+import org.opensearch.common.inject.Inject;
+import org.opensearch.common.lease.Releasables;
+import org.opensearch.common.util.concurrent.ConcurrentCollections;
+import org.opensearch.common.util.set.Sets;
+import org.opensearch.index.shard.ShardId;
+import org.opensearch.indices.store.TransportNodesListShardStoreMetadata;
 
 import java.util.Collections;
 import java.util.List;
diff --git a/server/src/main/java/org/elasticsearch/gateway/GatewayException.java b/server/src/main/java/org/opensearch/gateway/GatewayException.java
similarity index 87%
rename from server/src/main/java/org/elasticsearch/gateway/GatewayException.java
rename to server/src/main/java/org/opensearch/gateway/GatewayException.java
index 7b30a9ce88a..50563d5f700 100644
--- a/server/src/main/java/org/elasticsearch/gateway/GatewayException.java
+++ b/server/src/main/java/org/opensearch/gateway/GatewayException.java
@@ -17,10 +17,10 @@
  * under the License.
  */
 
-package org.elasticsearch.gateway;
+package org.opensearch.gateway;
 
-import org.elasticsearch.OpenSearchException;
-import org.elasticsearch.common.io.stream.StreamInput;
+import org.opensearch.OpenSearchException;
+import org.opensearch.common.io.stream.StreamInput;
 
 import java.io.IOException;
 
diff --git a/server/src/main/java/org/elasticsearch/gateway/GatewayMetaState.java b/server/src/main/java/org/opensearch/gateway/GatewayMetaState.java
similarity index 95%
rename from server/src/main/java/org/elasticsearch/gateway/GatewayMetaState.java
rename to server/src/main/java/org/opensearch/gateway/GatewayMetaState.java
index 08ec184af83..6f0dfc78a2c 100644
--- a/server/src/main/java/org/elasticsearch/gateway/GatewayMetaState.java
+++ b/server/src/main/java/org/opensearch/gateway/GatewayMetaState.java
@@ -17,16 +17,16 @@
  * under the License.
  */
 
-package org.elasticsearch.gateway;
+package org.opensearch.gateway;
 
 import com.carrotsearch.hppc.cursors.ObjectObjectCursor;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.apache.lucene.store.AlreadyClosedException;
 import org.apache.lucene.util.SetOnce;
-import org.elasticsearch.OpenSearchException;
-import org.elasticsearch.ExceptionsHelper;
-import org.elasticsearch.Version;
+import org.opensearch.OpenSearchException;
+import org.opensearch.ExceptionsHelper;
+import org.opensearch.Version;
 import org.opensearch.cluster.ClusterChangedEvent;
 import org.opensearch.cluster.ClusterName;
 import org.opensearch.cluster.ClusterState;
@@ -34,26 +34,26 @@ import org.opensearch.cluster.ClusterStateApplier;
 import org.opensearch.cluster.coordination.CoordinationMetadata;
 import org.opensearch.cluster.coordination.CoordinationState.PersistedState;
 import org.opensearch.cluster.coordination.InMemoryPersistedState;
-import org.elasticsearch.cluster.metadata.IndexMetadata;
-import org.elasticsearch.cluster.metadata.IndexTemplateMetadata;
-import org.elasticsearch.cluster.metadata.Manifest;
-import org.elasticsearch.cluster.metadata.Metadata;
-import org.elasticsearch.cluster.metadata.MetadataIndexUpgradeService;
-import org.elasticsearch.cluster.node.DiscoveryNode;
-import org.elasticsearch.cluster.service.ClusterService;
-import org.elasticsearch.common.collect.ImmutableOpenMap;
-import org.elasticsearch.common.collect.Tuple;
-import org.elasticsearch.common.settings.Settings;
-import org.elasticsearch.common.util.concurrent.AbstractRunnable;
-import org.elasticsearch.common.util.concurrent.EsExecutors;
-import org.elasticsearch.common.util.concurrent.EsThreadPoolExecutor;
-import org.elasticsearch.core.internal.io.IOUtils;
-import org.elasticsearch.discovery.DiscoveryModule;
-import org.elasticsearch.env.NodeMetadata;
-import org.elasticsearch.node.Node;
-import org.elasticsearch.plugins.MetadataUpgrader;
+import org.opensearch.cluster.metadata.IndexMetadata;
+import org.opensearch.cluster.metadata.IndexTemplateMetadata;
+import org.opensearch.cluster.metadata.Manifest;
+import org.opensearch.cluster.metadata.Metadata;
+import org.opensearch.cluster.metadata.MetadataIndexUpgradeService;
+import org.opensearch.cluster.node.DiscoveryNode;
+import org.opensearch.cluster.service.ClusterService;
+import org.opensearch.common.collect.ImmutableOpenMap;
+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.EsExecutors;
+import org.opensearch.common.util.concurrent.EsThreadPoolExecutor;
+import org.opensearch.core.internal.io.IOUtils;
+import org.opensearch.discovery.DiscoveryModule;
+import org.opensearch.env.NodeMetadata;
+import org.opensearch.node.Node;
+import org.opensearch.plugins.MetadataUpgrader;
 import org.opensearch.threadpool.ThreadPool;
-import org.elasticsearch.transport.TransportService;
+import org.opensearch.transport.TransportService;
 
 import java.io.Closeable;
 import java.io.IOException;
@@ -69,7 +69,7 @@ import java.util.function.Consumer;
 import java.util.function.Function;
 import java.util.function.UnaryOperator;
 
-import static org.elasticsearch.common.util.concurrent.EsExecutors.daemonThreadFactory;
+import static org.opensearch.common.util.concurrent.EsExecutors.daemonThreadFactory;
 
 /**
  * Loads (and maybe upgrades) cluster metadata at startup, and persistently stores cluster metadata for future restarts.
@@ -486,7 +486,7 @@ public class GatewayMetaState implements Closeable {
 
             // In the common case it's actually sufficient to commit() the existing state and not do any indexing. For instance,
             // this is true if there's only one data path on this master node, and the commit we just loaded was already written out
-            // by this version of Elasticsearch. TODO TBD should we avoid indexing when possible?
+            // by this version of OpenSearch. TODO TBD should we avoid indexing when possible?
             final PersistedClusterStateService.Writer writer = persistedClusterStateService.createWriter();
             try {
                 writer.writeFullStateAndCommit(currentTerm, lastAcceptedState);
diff --git a/server/src/main/java/org/elasticsearch/gateway/GatewayModule.java b/server/src/main/java/org/opensearch/gateway/GatewayModule.java
similarity index 93%
rename from server/src/main/java/org/elasticsearch/gateway/GatewayModule.java
rename to server/src/main/java/org/opensearch/gateway/GatewayModule.java
index b958e42a8b5..821a6d65bd4 100644
--- a/server/src/main/java/org/elasticsearch/gateway/GatewayModule.java
+++ b/server/src/main/java/org/opensearch/gateway/GatewayModule.java
@@ -17,9 +17,9 @@
  * under the License.
  */
 
-package org.elasticsearch.gateway;
+package org.opensearch.gateway;
 
-import org.elasticsearch.common.inject.AbstractModule;
+import org.opensearch.common.inject.AbstractModule;
 
 public class GatewayModule extends AbstractModule {
 
diff --git a/server/src/main/java/org/elasticsearch/gateway/GatewayService.java b/server/src/main/java/org/opensearch/gateway/GatewayService.java
similarity index 94%
rename from server/src/main/java/org/elasticsearch/gateway/GatewayService.java
rename to server/src/main/java/org/opensearch/gateway/GatewayService.java
index 641ea8e96a6..44a28a289cd 100644
--- a/server/src/main/java/org/elasticsearch/gateway/GatewayService.java
+++ b/server/src/main/java/org/opensearch/gateway/GatewayService.java
@@ -17,7 +17,7 @@
  * under the License.
  */
 
-package org.elasticsearch.gateway;
+package org.opensearch.gateway;
 
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
@@ -29,19 +29,19 @@ import org.opensearch.cluster.ClusterStateUpdateTask;
 import org.opensearch.cluster.block.ClusterBlock;
 import org.opensearch.cluster.block.ClusterBlockLevel;
 import org.opensearch.cluster.coordination.Coordinator;
-import org.elasticsearch.cluster.node.DiscoveryNode;
-import org.elasticsearch.cluster.node.DiscoveryNodes;
-import org.elasticsearch.cluster.routing.allocation.AllocationService;
-import org.elasticsearch.cluster.service.ClusterService;
-import org.elasticsearch.common.component.AbstractLifecycleComponent;
-import org.elasticsearch.common.inject.Inject;
-import org.elasticsearch.common.settings.Setting;
-import org.elasticsearch.common.settings.Setting.Property;
-import org.elasticsearch.common.settings.Settings;
-import org.elasticsearch.common.unit.TimeValue;
-import org.elasticsearch.common.util.concurrent.AbstractRunnable;
-import org.elasticsearch.discovery.Discovery;
-import org.elasticsearch.discovery.zen.ZenDiscovery;
+import org.opensearch.cluster.node.DiscoveryNode;
+import org.opensearch.cluster.node.DiscoveryNodes;
+import org.opensearch.cluster.routing.allocation.AllocationService;
+import org.opensearch.cluster.service.ClusterService;
+import org.opensearch.common.component.AbstractLifecycleComponent;
+import org.opensearch.common.inject.Inject;
+import org.opensearch.common.settings.Setting;
+import org.opensearch.common.settings.Setting.Property;
+import org.opensearch.common.settings.Settings;
+import org.opensearch.common.unit.TimeValue;
+import org.opensearch.common.util.concurrent.AbstractRunnable;
+import org.opensearch.discovery.Discovery;
+import org.opensearch.discovery.zen.ZenDiscovery;
 import org.opensearch.rest.RestStatus;
 import org.opensearch.threadpool.ThreadPool;
 
diff --git a/server/src/main/java/org/elasticsearch/gateway/IncrementalClusterStateWriter.java b/server/src/main/java/org/opensearch/gateway/IncrementalClusterStateWriter.java
similarity index 97%
rename from server/src/main/java/org/elasticsearch/gateway/IncrementalClusterStateWriter.java
rename to server/src/main/java/org/opensearch/gateway/IncrementalClusterStateWriter.java
index 430cccf86de..36d4935e6d2 100644
--- a/server/src/main/java/org/elasticsearch/gateway/IncrementalClusterStateWriter.java
+++ b/server/src/main/java/org/opensearch/gateway/IncrementalClusterStateWriter.java
@@ -16,20 +16,20 @@
  * specific language governing permissions and limitations
  * under the License.
  */
-package org.elasticsearch.gateway;
+package org.opensearch.gateway;
 
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.opensearch.cluster.ClusterState;
-import org.elasticsearch.cluster.metadata.IndexMetadata;
-import org.elasticsearch.cluster.metadata.Manifest;
-import org.elasticsearch.cluster.metadata.Metadata;
-import org.elasticsearch.cluster.routing.RoutingNode;
-import org.elasticsearch.cluster.routing.ShardRouting;
-import org.elasticsearch.common.settings.ClusterSettings;
-import org.elasticsearch.common.settings.Settings;
-import org.elasticsearch.common.unit.TimeValue;
-import org.elasticsearch.index.Index;
+import org.opensearch.cluster.metadata.IndexMetadata;
+import org.opensearch.cluster.metadata.Manifest;
+import org.opensearch.cluster.metadata.Metadata;
+import org.opensearch.cluster.routing.RoutingNode;
+import org.opensearch.cluster.routing.ShardRouting;
+import org.opensearch.common.settings.ClusterSettings;
+import org.opensearch.common.settings.Settings;
+import org.opensearch.common.unit.TimeValue;
+import org.opensearch.index.Index;
 
 import java.util.ArrayList;
 import java.util.HashMap;
diff --git a/server/src/main/java/org/elasticsearch/gateway/LocalAllocateDangledIndices.java b/server/src/main/java/org/opensearch/gateway/LocalAllocateDangledIndices.java
similarity index 90%
rename from server/src/main/java/org/elasticsearch/gateway/LocalAllocateDangledIndices.java
rename to server/src/main/java/org/opensearch/gateway/LocalAllocateDangledIndices.java
index 2e1a6fa69b5..fe931686ca7 100644
--- a/server/src/main/java/org/elasticsearch/gateway/LocalAllocateDangledIndices.java
+++ b/server/src/main/java/org/opensearch/gateway/LocalAllocateDangledIndices.java
@@ -17,43 +17,43 @@
  * under the License.
  */
 
-package org.elasticsearch.gateway;
+package org.opensearch.gateway;
 
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.apache.logging.log4j.message.ParameterizedMessage;
-import org.elasticsearch.Version;
+import org.opensearch.Version;
 import org.opensearch.action.ActionListener;
 import org.opensearch.action.ActionListenerResponseHandler;
 import org.opensearch.cluster.ClusterState;
 import org.opensearch.cluster.ClusterStateUpdateTask;
 import org.opensearch.cluster.block.ClusterBlocks;
-import org.elasticsearch.cluster.metadata.IndexMetadata;
-import org.elasticsearch.cluster.metadata.Metadata;
-import org.elasticsearch.cluster.metadata.MetadataIndexUpgradeService;
-import org.elasticsearch.cluster.node.DiscoveryNode;
-import org.elasticsearch.cluster.routing.RoutingTable;
-import org.elasticsearch.cluster.routing.allocation.AllocationService;
-import org.elasticsearch.cluster.service.ClusterService;
-import org.elasticsearch.common.UUIDs;
-import org.elasticsearch.common.inject.Inject;
-import org.elasticsearch.common.io.stream.StreamInput;
-import org.elasticsearch.common.io.stream.StreamOutput;
-import org.elasticsearch.common.settings.Settings;
-import org.elasticsearch.discovery.MasterNotDiscoveredException;
+import org.opensearch.cluster.metadata.IndexMetadata;
+import org.opensearch.cluster.metadata.Metadata;
+import org.opensearch.cluster.metadata.MetadataIndexUpgradeService;
+import org.opensearch.cluster.node.DiscoveryNode;
+import org.opensearch.cluster.routing.RoutingTable;
+import org.opensearch.cluster.routing.allocation.AllocationService;
+import org.opensearch.cluster.service.ClusterService;
+import org.opensearch.common.UUIDs;
+import org.opensearch.common.inject.Inject;
+import org.opensearch.common.io.stream.StreamInput;
+import org.opensearch.common.io.stream.StreamOutput;
+import org.opensearch.common.settings.Settings;
+import org.opensearch.discovery.MasterNotDiscoveredException;
 import org.opensearch.tasks.Task;
 import org.opensearch.threadpool.ThreadPool;
-import org.elasticsearch.transport.TransportChannel;
-import org.elasticsearch.transport.TransportRequest;
-import org.elasticsearch.transport.TransportRequestHandler;
-import org.elasticsearch.transport.TransportResponse;
-import org.elasticsearch.transport.TransportService;
+import org.opensearch.transport.TransportChannel;
+import org.opensearch.transport.TransportRequest;
+import org.opensearch.transport.TransportRequestHandler;
+import org.opensearch.transport.TransportResponse;
+import org.opensearch.transport.TransportService;
 
 import java.io.IOException;
 import java.util.Arrays;
 import java.util.Collection;
 
-import static org.elasticsearch.cluster.metadata.MetadataIndexStateService.isIndexVerifiedBeforeClosed;
+import static org.opensearch.cluster.metadata.MetadataIndexStateService.isIndexVerifiedBeforeClosed;
 
 public class LocalAllocateDangledIndices {
 
diff --git a/server/src/main/java/org/elasticsearch/gateway/MetaStateService.java b/server/src/main/java/org/opensearch/gateway/MetaStateService.java
similarity index 96%
rename from server/src/main/java/org/elasticsearch/gateway/MetaStateService.java
rename to server/src/main/java/org/opensearch/gateway/MetaStateService.java
index d37032f03cd..cb0db73d3d8 100644
--- a/server/src/main/java/org/elasticsearch/gateway/MetaStateService.java
+++ b/server/src/main/java/org/opensearch/gateway/MetaStateService.java
@@ -17,20 +17,20 @@
  * under the License.
  */
 
-package org.elasticsearch.gateway;
+package org.opensearch.gateway;
 
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
-import org.elasticsearch.Version;
-import org.elasticsearch.cluster.metadata.IndexGraveyard;
-import org.elasticsearch.cluster.metadata.IndexMetadata;
-import org.elasticsearch.cluster.metadata.Manifest;
-import org.elasticsearch.cluster.metadata.Metadata;
-import org.elasticsearch.common.Nullable;
-import org.elasticsearch.common.collect.Tuple;
-import org.elasticsearch.common.xcontent.NamedXContentRegistry;
-import org.elasticsearch.env.NodeEnvironment;
-import org.elasticsearch.index.Index;
+import org.opensearch.Version;
+import org.opensearch.cluster.metadata.IndexGraveyard;
+import org.opensearch.cluster.metadata.IndexMetadata;
+import org.opensearch.cluster.metadata.Manifest;
+import org.opensearch.cluster.metadata.Metadata;
+import org.opensearch.common.Nullable;
+import org.opensearch.common.collect.Tuple;
+import org.opensearch.common.xcontent.NamedXContentRegistry;
+import org.opensearch.env.NodeEnvironment;
+import org.opensearch.index.Index;
 
 import java.io.IOException;
 import java.util.ArrayList;
diff --git a/server/src/main/java/org/elasticsearch/gateway/MetadataStateFormat.java b/server/src/main/java/org/opensearch/gateway/MetadataStateFormat.java
similarity index 96%
rename from server/src/main/java/org/elasticsearch/gateway/MetadataStateFormat.java
rename to server/src/main/java/org/opensearch/gateway/MetadataStateFormat.java
index 0b11f3a2d83..fee3df3a2d4 100644
--- a/server/src/main/java/org/elasticsearch/gateway/MetadataStateFormat.java
+++ b/server/src/main/java/org/opensearch/gateway/MetadataStateFormat.java
@@ -16,7 +16,7 @@
  * specific language governing permissions and limitations
  * under the License.
  */
-package org.elasticsearch.gateway;
+package org.opensearch.gateway;
 
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
@@ -30,17 +30,17 @@ import org.apache.lucene.store.IOContext;
 import org.apache.lucene.store.IndexInput;
 import org.apache.lucene.store.IndexOutput;
 import org.apache.lucene.store.SimpleFSDirectory;
-import org.elasticsearch.ExceptionsHelper;
-import org.elasticsearch.common.collect.Tuple;
-import org.elasticsearch.common.lucene.store.IndexOutputOutputStream;
-import org.elasticsearch.common.lucene.store.InputStreamIndexInput;
-import org.elasticsearch.common.xcontent.LoggingDeprecationHandler;
-import org.elasticsearch.common.xcontent.NamedXContentRegistry;
-import org.elasticsearch.common.xcontent.XContentBuilder;
-import org.elasticsearch.common.xcontent.XContentFactory;
-import org.elasticsearch.common.xcontent.XContentParser;
-import org.elasticsearch.common.xcontent.XContentType;
-import org.elasticsearch.core.internal.io.IOUtils;
+import org.opensearch.ExceptionsHelper;
+import org.opensearch.common.collect.Tuple;
+import org.opensearch.common.lucene.store.IndexOutputOutputStream;
+import org.opensearch.common.lucene.store.InputStreamIndexInput;
+import org.opensearch.common.xcontent.LoggingDeprecationHandler;
+import org.opensearch.common.xcontent.NamedXContentRegistry;
+import org.opensearch.common.xcontent.XContentBuilder;
+import org.opensearch.common.xcontent.XContentFactory;
+import org.opensearch.common.xcontent.XContentParser;
+import org.opensearch.common.xcontent.XContentType;
+import org.opensearch.core.internal.io.IOUtils;
 
 import java.io.FileNotFoundException;
 import java.io.IOException;
diff --git a/server/src/main/java/org/elasticsearch/gateway/PersistedClusterStateService.java b/server/src/main/java/org/opensearch/gateway/PersistedClusterStateService.java
similarity index 96%
rename from server/src/main/java/org/elasticsearch/gateway/PersistedClusterStateService.java
rename to server/src/main/java/org/opensearch/gateway/PersistedClusterStateService.java
index 243e2683aa4..bc3e0de3c45 100644
--- a/server/src/main/java/org/elasticsearch/gateway/PersistedClusterStateService.java
+++ b/server/src/main/java/org/opensearch/gateway/PersistedClusterStateService.java
@@ -16,7 +16,7 @@
  * specific language governing permissions and limitations
  * under the License.
  */
-package org.elasticsearch.gateway;
+package org.opensearch.gateway;
 
 import com.carrotsearch.hppc.cursors.ObjectCursor;
 import org.apache.logging.log4j.LogManager;
@@ -48,35 +48,35 @@ import org.apache.lucene.util.Bits;
 import org.apache.lucene.util.BytesRef;
 import org.apache.lucene.util.BytesRefIterator;
 import org.apache.lucene.util.SetOnce;
-import org.elasticsearch.Version;
+import org.opensearch.Version;
 import org.opensearch.cluster.ClusterState;
-import org.elasticsearch.cluster.metadata.IndexMetadata;
-import org.elasticsearch.cluster.metadata.Metadata;
-import org.elasticsearch.common.CheckedConsumer;
-import org.elasticsearch.common.Nullable;
-import org.elasticsearch.common.bytes.BytesReference;
-import org.elasticsearch.common.bytes.RecyclingBytesStreamOutput;
-import org.elasticsearch.common.io.Streams;
-import org.elasticsearch.common.lease.Releasable;
-import org.elasticsearch.common.lease.Releasables;
-import org.elasticsearch.common.logging.Loggers;
-import org.elasticsearch.common.lucene.Lucene;
-import org.elasticsearch.common.settings.ClusterSettings;
-import org.elasticsearch.common.settings.Setting;
-import org.elasticsearch.common.unit.TimeValue;
-import org.elasticsearch.common.util.BigArrays;
-import org.elasticsearch.common.util.ByteArray;
-import org.elasticsearch.common.util.PageCacheRecycler;
-import org.elasticsearch.common.xcontent.LoggingDeprecationHandler;
-import org.elasticsearch.common.xcontent.NamedXContentRegistry;
-import org.elasticsearch.common.xcontent.ToXContent;
-import org.elasticsearch.common.xcontent.XContentBuilder;
-import org.elasticsearch.common.xcontent.XContentFactory;
-import org.elasticsearch.common.xcontent.XContentType;
-import org.elasticsearch.core.internal.io.IOUtils;
-import org.elasticsearch.env.NodeEnvironment;
-import org.elasticsearch.env.NodeMetadata;
-import org.elasticsearch.index.Index;
+import org.opensearch.cluster.metadata.IndexMetadata;
+import org.opensearch.cluster.metadata.Metadata;
+import org.opensearch.common.CheckedConsumer;
+import org.opensearch.common.Nullable;
+import org.opensearch.common.bytes.BytesReference;
+import org.opensearch.common.bytes.RecyclingBytesStreamOutput;
+import org.opensearch.common.io.Streams;
+import org.opensearch.common.lease.Releasable;
+import org.opensearch.common.lease.Releasables;
+import org.opensearch.common.logging.Loggers;
+import org.opensearch.common.lucene.Lucene;
+import org.opensearch.common.settings.ClusterSettings;
+import org.opensearch.common.settings.Setting;
+import org.opensearch.common.unit.TimeValue;
+import org.opensearch.common.util.BigArrays;
+import org.opensearch.common.util.ByteArray;
+import org.opensearch.common.util.PageCacheRecycler;
+import org.opensearch.common.xcontent.LoggingDeprecationHandler;
+import org.opensearch.common.xcontent.NamedXContentRegistry;
+import org.opensearch.common.xcontent.ToXContent;
+import org.opensearch.common.xcontent.XContentBuilder;
+import org.opensearch.common.xcontent.XContentFactory;
+import org.opensearch.common.xcontent.XContentType;
+import org.opensearch.core.internal.io.IOUtils;
+import org.opensearch.env.NodeEnvironment;
+import org.opensearch.env.NodeMetadata;
+import org.opensearch.index.Index;
 
 import java.io.Closeable;
 import java.io.IOError;
diff --git a/server/src/main/java/org/elasticsearch/gateway/PrimaryShardAllocator.java b/server/src/main/java/org/opensearch/gateway/PrimaryShardAllocator.java
similarity index 94%
rename from server/src/main/java/org/elasticsearch/gateway/PrimaryShardAllocator.java
rename to server/src/main/java/org/opensearch/gateway/PrimaryShardAllocator.java
index 383b554fb21..c0a64a10813 100644
--- a/server/src/main/java/org/elasticsearch/gateway/PrimaryShardAllocator.java
+++ b/server/src/main/java/org/opensearch/gateway/PrimaryShardAllocator.java
@@ -17,27 +17,27 @@
  * under the License.
  */
 
-package org.elasticsearch.gateway;
+package org.opensearch.gateway;
 
 import org.apache.logging.log4j.Logger;
 import org.apache.logging.log4j.message.ParameterizedMessage;
-import org.elasticsearch.cluster.metadata.IndexMetadata;
-import org.elasticsearch.cluster.node.DiscoveryNode;
-import org.elasticsearch.cluster.routing.RecoverySource;
-import org.elasticsearch.cluster.routing.RoutingNode;
-import org.elasticsearch.cluster.routing.RoutingNodes;
-import org.elasticsearch.cluster.routing.ShardRouting;
-import org.elasticsearch.cluster.routing.UnassignedInfo;
-import org.elasticsearch.cluster.routing.UnassignedInfo.AllocationStatus;
-import org.elasticsearch.cluster.routing.allocation.AllocateUnassignedDecision;
-import org.elasticsearch.cluster.routing.allocation.NodeAllocationResult;
-import org.elasticsearch.cluster.routing.allocation.NodeAllocationResult.ShardStoreInfo;
-import org.elasticsearch.cluster.routing.allocation.RoutingAllocation;
-import org.elasticsearch.cluster.routing.allocation.decider.Decision;
-import org.elasticsearch.cluster.routing.allocation.decider.Decision.Type;
-import org.elasticsearch.env.ShardLockObtainFailedException;
-import org.elasticsearch.gateway.AsyncShardFetch.FetchResult;
-import org.elasticsearch.gateway.TransportNodesListGatewayStartedShards.NodeGatewayStartedShards;
+import org.opensearch.cluster.metadata.IndexMetadata;
+import org.opensearch.cluster.node.DiscoveryNode;
+import org.opensearch.cluster.routing.RecoverySource;
+import org.opensearch.cluster.routing.RoutingNode;
+import org.opensearch.cluster.routing.RoutingNodes;
+import org.opensearch.cluster.routing.ShardRouting;
+import org.opensearch.cluster.routing.UnassignedInfo;
+import org.opensearch.cluster.routing.UnassignedInfo.AllocationStatus;
+import org.opensearch.cluster.routing.allocation.AllocateUnassignedDecision;
+import org.opensearch.cluster.routing.allocation.NodeAllocationResult;
+import org.opensearch.cluster.routing.allocation.NodeAllocationResult.ShardStoreInfo;
+import org.opensearch.cluster.routing.allocation.RoutingAllocation;
+import org.opensearch.cluster.routing.allocation.decider.Decision;
+import org.opensearch.cluster.routing.allocation.decider.Decision.Type;
+import org.opensearch.env.ShardLockObtainFailedException;
+import org.opensearch.gateway.AsyncShardFetch.FetchResult;
+import org.opensearch.gateway.TransportNodesListGatewayStartedShards.NodeGatewayStartedShards;
 
 import java.util.ArrayList;
 import java.util.Collection;
@@ -58,7 +58,7 @@ import java.util.stream.Stream;
  * executes the allocation deciders to chose a copy to assign the primary shard to.
  *
  * Note that the PrimaryShardAllocator does *not* allocate primaries on index creation
- * (see {@link org.elasticsearch.cluster.routing.allocation.allocator.BalancedShardsAllocator}),
+ * (see {@link org.opensearch.cluster.routing.allocation.allocator.BalancedShardsAllocator}),
  * nor does it allocate primaries when a primary shard failed and there is a valid replica
  * copy that can immediately be promoted to primary, as this takes place in {@link RoutingNodes#failShard}.
  */
diff --git a/server/src/main/java/org/elasticsearch/gateway/PriorityComparator.java b/server/src/main/java/org/opensearch/gateway/PriorityComparator.java
similarity index 91%
rename from server/src/main/java/org/elasticsearch/gateway/PriorityComparator.java
rename to server/src/main/java/org/opensearch/gateway/PriorityComparator.java
index 3b2b31fc6dd..4bdd65dcb71 100644
--- a/server/src/main/java/org/elasticsearch/gateway/PriorityComparator.java
+++ b/server/src/main/java/org/opensearch/gateway/PriorityComparator.java
@@ -17,13 +17,13 @@
  * under the License.
  */
 
-package org.elasticsearch.gateway;
+package org.opensearch.gateway;
 
-import org.elasticsearch.cluster.metadata.IndexMetadata;
-import org.elasticsearch.cluster.routing.ShardRouting;
-import org.elasticsearch.cluster.routing.allocation.RoutingAllocation;
-import org.elasticsearch.common.settings.Settings;
-import org.elasticsearch.index.Index;
+import org.opensearch.cluster.metadata.IndexMetadata;
+import org.opensearch.cluster.routing.ShardRouting;
+import org.opensearch.cluster.routing.allocation.RoutingAllocation;
+import org.opensearch.common.settings.Settings;
+import org.opensearch.index.Index;
 
 import java.util.Comparator;
 
diff --git a/server/src/main/java/org/elasticsearch/gateway/ReplicaShardAllocator.java b/server/src/main/java/org/opensearch/gateway/ReplicaShardAllocator.java
similarity index 94%
rename from server/src/main/java/org/elasticsearch/gateway/ReplicaShardAllocator.java
rename to server/src/main/java/org/opensearch/gateway/ReplicaShardAllocator.java
index 2a232366ec4..4c42698eb8b 100644
--- a/server/src/main/java/org/elasticsearch/gateway/ReplicaShardAllocator.java
+++ b/server/src/main/java/org/opensearch/gateway/ReplicaShardAllocator.java
@@ -17,30 +17,30 @@
  * under the License.
  */
 
-package org.elasticsearch.gateway;
+package org.opensearch.gateway;
 
 import com.carrotsearch.hppc.cursors.ObjectCursor;
 import org.apache.logging.log4j.Logger;
-import org.elasticsearch.cluster.metadata.IndexMetadata;
-import org.elasticsearch.cluster.metadata.Metadata;
-import org.elasticsearch.cluster.node.DiscoveryNode;
-import org.elasticsearch.cluster.routing.RoutingNode;
-import org.elasticsearch.cluster.routing.RoutingNodes;
-import org.elasticsearch.cluster.routing.ShardRouting;
-import org.elasticsearch.cluster.routing.UnassignedInfo;
-import org.elasticsearch.cluster.routing.UnassignedInfo.AllocationStatus;
-import org.elasticsearch.cluster.routing.allocation.AllocateUnassignedDecision;
-import org.elasticsearch.cluster.routing.allocation.NodeAllocationResult;
-import org.elasticsearch.cluster.routing.allocation.NodeAllocationResult.ShardStoreInfo;
-import org.elasticsearch.cluster.routing.allocation.RoutingAllocation;
-import org.elasticsearch.cluster.routing.allocation.decider.Decision;
-import org.elasticsearch.common.Nullable;
-import org.elasticsearch.common.collect.Tuple;
-import org.elasticsearch.common.unit.ByteSizeValue;
-import org.elasticsearch.common.unit.TimeValue;
-import org.elasticsearch.index.store.StoreFileMetadata;
-import org.elasticsearch.indices.store.TransportNodesListShardStoreMetadata;
-import org.elasticsearch.indices.store.TransportNodesListShardStoreMetadata.NodeStoreFilesMetadata;
+import org.opensearch.cluster.metadata.IndexMetadata;
+import org.opensearch.cluster.metadata.Metadata;
+import org.opensearch.cluster.node.DiscoveryNode;
+import org.opensearch.cluster.routing.RoutingNode;
+import org.opensearch.cluster.routing.RoutingNodes;
+import org.opensearch.cluster.routing.ShardRouting;
+import org.opensearch.cluster.routing.UnassignedInfo;
+import org.opensearch.cluster.routing.UnassignedInfo.AllocationStatus;
+import org.opensearch.cluster.routing.allocation.AllocateUnassignedDecision;
+import org.opensearch.cluster.routing.allocation.NodeAllocationResult;
+import org.opensearch.cluster.routing.allocation.NodeAllocationResult.ShardStoreInfo;
+import org.opensearch.cluster.routing.allocation.RoutingAllocation;
+import org.opensearch.cluster.routing.allocation.decider.Decision;
+import org.opensearch.common.Nullable;
+import org.opensearch.common.collect.Tuple;
+import org.opensearch.common.unit.ByteSizeValue;
+import org.opensearch.common.unit.TimeValue;
+import org.opensearch.index.store.StoreFileMetadata;
+import org.opensearch.indices.store.TransportNodesListShardStoreMetadata;
+import org.opensearch.indices.store.TransportNodesListShardStoreMetadata.NodeStoreFilesMetadata;
 
 import java.util.ArrayList;
 import java.util.Collections;
@@ -50,7 +50,7 @@ import java.util.List;
 import java.util.Map;
 import java.util.Set;
 
-import static org.elasticsearch.cluster.routing.UnassignedInfo.INDEX_DELAYED_NODE_LEFT_TIMEOUT_SETTING;
+import static org.opensearch.cluster.routing.UnassignedInfo.INDEX_DELAYED_NODE_LEFT_TIMEOUT_SETTING;
 
 public abstract class ReplicaShardAllocator extends BaseGatewayShardAllocator {
     /**
diff --git a/server/src/main/java/org/elasticsearch/gateway/TransportNodesListGatewayMetaState.java b/server/src/main/java/org/opensearch/gateway/TransportNodesListGatewayMetaState.java
similarity index 85%
rename from server/src/main/java/org/elasticsearch/gateway/TransportNodesListGatewayMetaState.java
rename to server/src/main/java/org/opensearch/gateway/TransportNodesListGatewayMetaState.java
index db9875675a2..84954d5daf1 100644
--- a/server/src/main/java/org/elasticsearch/gateway/TransportNodesListGatewayMetaState.java
+++ b/server/src/main/java/org/opensearch/gateway/TransportNodesListGatewayMetaState.java
@@ -17,29 +17,29 @@
  * under the License.
  */
 
-package org.elasticsearch.gateway;
+package org.opensearch.gateway;
 
 import org.opensearch.action.ActionFuture;
 import org.opensearch.action.ActionType;
 import org.opensearch.action.FailedNodeException;
-import org.elasticsearch.action.support.ActionFilters;
-import org.elasticsearch.action.support.PlainActionFuture;
-import org.elasticsearch.action.support.nodes.BaseNodeRequest;
-import org.elasticsearch.action.support.nodes.BaseNodeResponse;
-import org.elasticsearch.action.support.nodes.BaseNodesRequest;
-import org.elasticsearch.action.support.nodes.BaseNodesResponse;
-import org.elasticsearch.action.support.nodes.TransportNodesAction;
+import org.opensearch.action.support.ActionFilters;
+import org.opensearch.action.support.PlainActionFuture;
+import org.opensearch.action.support.nodes.BaseNodeRequest;
+import org.opensearch.action.support.nodes.BaseNodeResponse;
+import org.opensearch.action.support.nodes.BaseNodesRequest;
+import org.opensearch.action.support.nodes.BaseNodesResponse;
+import org.opensearch.action.support.nodes.TransportNodesAction;
 import org.opensearch.cluster.ClusterName;
-import org.elasticsearch.cluster.metadata.Metadata;
-import org.elasticsearch.cluster.node.DiscoveryNode;
-import org.elasticsearch.cluster.service.ClusterService;
-import org.elasticsearch.common.Nullable;
-import org.elasticsearch.common.inject.Inject;
-import org.elasticsearch.common.io.stream.StreamInput;
-import org.elasticsearch.common.io.stream.StreamOutput;
-import org.elasticsearch.common.unit.TimeValue;
+import org.opensearch.cluster.metadata.Metadata;
+import org.opensearch.cluster.node.DiscoveryNode;
+import org.opensearch.cluster.service.ClusterService;
+import org.opensearch.common.Nullable;
+import org.opensearch.common.inject.Inject;
+import org.opensearch.common.io.stream.StreamInput;
+import org.opensearch.common.io.stream.StreamOutput;
+import org.opensearch.common.unit.TimeValue;
 import org.opensearch.threadpool.ThreadPool;
-import org.elasticsearch.transport.TransportService;
+import org.opensearch.transport.TransportService;
 
 import java.io.IOException;
 import java.util.List;
diff --git a/server/src/main/java/org/elasticsearch/gateway/TransportNodesListGatewayStartedShards.java b/server/src/main/java/org/opensearch/gateway/TransportNodesListGatewayStartedShards.java
similarity index 91%
rename from server/src/main/java/org/elasticsearch/gateway/TransportNodesListGatewayStartedShards.java
rename to server/src/main/java/org/opensearch/gateway/TransportNodesListGatewayStartedShards.java
index d48cd6c69d7..18b468b9360 100644
--- a/server/src/main/java/org/elasticsearch/gateway/TransportNodesListGatewayStartedShards.java
+++ b/server/src/main/java/org/opensearch/gateway/TransportNodesListGatewayStartedShards.java
@@ -17,39 +17,39 @@
  * under the License.
  */
 
-package org.elasticsearch.gateway;
+package org.opensearch.gateway;
 
 import org.apache.logging.log4j.message.ParameterizedMessage;
-import org.elasticsearch.OpenSearchException;
-import org.elasticsearch.Version;
+import org.opensearch.OpenSearchException;
+import org.opensearch.Version;
 import org.opensearch.action.ActionListener;
 import org.opensearch.action.ActionType;
 import org.opensearch.action.FailedNodeException;
-import org.elasticsearch.action.support.ActionFilters;
-import org.elasticsearch.action.support.nodes.BaseNodeRequest;
-import org.elasticsearch.action.support.nodes.BaseNodeResponse;
-import org.elasticsearch.action.support.nodes.BaseNodesRequest;
-import org.elasticsearch.action.support.nodes.BaseNodesResponse;
-import org.elasticsearch.action.support.nodes.TransportNodesAction;
+import org.opensearch.action.support.ActionFilters;
+import org.opensearch.action.support.nodes.BaseNodeRequest;
+import org.opensearch.action.support.nodes.BaseNodeResponse;
+import org.opensearch.action.support.nodes.BaseNodesRequest;
+import org.opensearch.action.support.nodes.BaseNodesResponse;
+import org.opensearch.action.support.nodes.TransportNodesAction;
 import org.opensearch.cluster.ClusterName;
-import org.elasticsearch.cluster.metadata.IndexMetadata;
-import org.elasticsearch.cluster.node.DiscoveryNode;
-import org.elasticsearch.cluster.service.ClusterService;
-import org.elasticsearch.common.Nullable;
-import org.elasticsearch.common.inject.Inject;
-import org.elasticsearch.common.io.stream.StreamInput;
-import org.elasticsearch.common.io.stream.StreamOutput;
-import org.elasticsearch.common.settings.Settings;
-import org.elasticsearch.common.xcontent.NamedXContentRegistry;
-import org.elasticsearch.env.NodeEnvironment;
-import org.elasticsearch.index.IndexSettings;
-import org.elasticsearch.index.shard.ShardId;
-import org.elasticsearch.index.shard.ShardPath;
-import org.elasticsearch.index.shard.ShardStateMetadata;
-import org.elasticsearch.index.store.Store;
-import org.elasticsearch.indices.IndicesService;
+import org.opensearch.cluster.metadata.IndexMetadata;
+import org.opensearch.cluster.node.DiscoveryNode;
+import org.opensearch.cluster.service.ClusterService;
+import org.opensearch.common.Nullable;
+import org.opensearch.common.inject.Inject;
+import org.opensearch.common.io.stream.StreamInput;
+import org.opensearch.common.io.stream.StreamOutput;
+import org.opensearch.common.settings.Settings;
+import org.opensearch.common.xcontent.NamedXContentRegistry;
+import org.opensearch.env.NodeEnvironment;
+import org.opensearch.index.IndexSettings;
+import org.opensearch.index.shard.ShardId;
+import org.opensearch.index.shard.ShardPath;
+import org.opensearch.index.shard.ShardStateMetadata;
+import org.opensearch.index.store.Store;
+import org.opensearch.indices.IndicesService;
 import org.opensearch.threadpool.ThreadPool;
-import org.elasticsearch.transport.TransportService;
+import org.opensearch.transport.TransportService;
 
 import java.io.IOException;
 import java.util.List;
diff --git a/server/src/main/java/org/elasticsearch/gateway/WriteStateException.java b/server/src/main/java/org/opensearch/gateway/WriteStateException.java
similarity index 98%
rename from server/src/main/java/org/elasticsearch/gateway/WriteStateException.java
rename to server/src/main/java/org/opensearch/gateway/WriteStateException.java
index 29699be2c16..36b66dd1379 100644
--- a/server/src/main/java/org/elasticsearch/gateway/WriteStateException.java
+++ b/server/src/main/java/org/opensearch/gateway/WriteStateException.java
@@ -16,7 +16,7 @@
  * specific language governing permissions and limitations
  * under the License.
  */
-package org.elasticsearch.gateway;
+package org.opensearch.gateway;
 
 import java.io.IOError;
 import java.io.IOException;