diff --git a/client/rest-high-level/src/main/java/org/opensearch/client/RequestConverters.java b/client/rest-high-level/src/main/java/org/opensearch/client/RequestConverters.java
index acafcf96c2a..f0f33ae1e71 100644
--- a/client/rest-high-level/src/main/java/org/opensearch/client/RequestConverters.java
+++ b/client/rest-high-level/src/main/java/org/opensearch/client/RequestConverters.java
@@ -363,6 +363,7 @@ final class RequestConverters {
         parameters.withPipeline(indexRequest.getPipeline());
         parameters.withRefreshPolicy(indexRequest.getRefreshPolicy());
         parameters.withWaitForActiveShards(indexRequest.waitForActiveShards());
+        parameters.withRequireAlias(indexRequest.isRequireAlias());
 
         BytesRef source = indexRequest.source().toBytesRef();
         ContentType contentType = createContentType(indexRequest.getContentType());
@@ -391,6 +392,7 @@ final class RequestConverters {
         parameters.withRetryOnConflict(updateRequest.retryOnConflict());
         parameters.withVersion(updateRequest.version());
         parameters.withVersionType(updateRequest.versionType());
+        parameters.withRequireAlias(updateRequest.isRequireAlias());
 
         // The Java API allows update requests with different content types
         // set for the partial document and the upsert document. This client
@@ -618,6 +620,7 @@ final class RequestConverters {
             .withTimeout(reindexRequest.getTimeout())
             .withWaitForActiveShards(reindexRequest.getWaitForActiveShards())
             .withRequestsPerSecond(reindexRequest.getRequestsPerSecond())
+            .withRequireAlias(reindexRequest.getDestination().isRequireAlias())
             .withSlices(reindexRequest.getSlices());
 
         if (reindexRequest.getScrollTime() != null) {
@@ -964,6 +967,13 @@ final class RequestConverters {
             }
         }
 
+        Params withRequireAlias(boolean requireAlias) {
+            if (requireAlias) {
+                return putParam("require_alias", Boolean.TRUE.toString());
+            }
+            return this;
+        }
+
         Params withRetryOnConflict(int retryOnConflict) {
             if (retryOnConflict > 0) {
                 return putParam("retry_on_conflict", String.valueOf(retryOnConflict));
diff --git a/client/rest-high-level/src/test/java/org/opensearch/client/CrudIT.java b/client/rest-high-level/src/test/java/org/opensearch/client/CrudIT.java
index 56d46357726..69602bb766d 100644
--- a/client/rest-high-level/src/test/java/org/opensearch/client/CrudIT.java
+++ b/client/rest-high-level/src/test/java/org/opensearch/client/CrudIT.java
@@ -686,6 +686,21 @@ public class CrudIT extends OpenSearchRestHighLevelClientTestCase {
                 exception.getMessage()
             );
         }
+        {
+            OpenSearchStatusException exception = expectThrows(OpenSearchStatusException.class, () -> {
+                IndexRequest indexRequest = new IndexRequest("index").id("missing_alias").setRequireAlias(true);
+                indexRequest.source(XContentBuilder.builder(xContentType.xContent()).startObject().field("field", "test").endObject());
+
+                execute(indexRequest, highLevelClient()::index, highLevelClient()::indexAsync);
+            });
+
+            assertEquals(RestStatus.NOT_FOUND, exception.status());
+            assertEquals(
+                "OpenSearch exception [type=index_not_found_exception, reason=no such index [index]"
+                    + " and [require_alias] request flag is [true] and [index] is not an alias]",
+                exception.getMessage()
+            );
+        }
         {
             IndexRequest indexRequest = new IndexRequest("index").id("external_version_type");
             indexRequest.source(XContentBuilder.builder(xContentType.xContent()).startObject().field("field", "test").endObject());
@@ -926,6 +941,18 @@ public class CrudIT extends OpenSearchRestHighLevelClientTestCase {
                 exception.getMessage()
             );
         }
+        {
+            OpenSearchException exception = expectThrows(OpenSearchException.class, () -> {
+                UpdateRequest updateRequest = new UpdateRequest("index", "require_alias").setRequireAlias(true);
+                updateRequest.doc(new IndexRequest().source(Collections.singletonMap("field", "doc"), XContentType.JSON));
+                execute(updateRequest, highLevelClient()::update, highLevelClient()::updateAsync);
+            });
+            assertEquals(RestStatus.NOT_FOUND, exception.status());
+            assertEquals(
+                "OpenSearch exception [type=index_not_found_exception, reason=no such index [index] and [require_alias] request flag is [true] and [index] is not an alias]",
+                exception.getMessage()
+            );
+        }
     }
 
     public void testUpdateWithTypes() throws IOException {
diff --git a/client/rest-high-level/src/test/java/org/opensearch/client/ReindexIT.java b/client/rest-high-level/src/test/java/org/opensearch/client/ReindexIT.java
index 5576b9d5ef2..78fb2aef02e 100644
--- a/client/rest-high-level/src/test/java/org/opensearch/client/ReindexIT.java
+++ b/client/rest-high-level/src/test/java/org/opensearch/client/ReindexIT.java
@@ -32,6 +32,7 @@
 
 package org.opensearch.client;
 
+import org.opensearch.OpenSearchStatusException;
 import org.opensearch.action.ActionListener;
 import org.opensearch.action.admin.cluster.node.tasks.list.ListTasksResponse;
 import org.opensearch.action.bulk.BulkItemResponse;
@@ -102,6 +103,25 @@ public class ReindexIT extends OpenSearchRestHighLevelClientTestCase {
             assertEquals(0, bulkResponse.getBulkFailures().size());
             assertEquals(0, bulkResponse.getSearchFailures().size());
         }
+        {
+            // set require_alias=true, but there exists no alias
+            ReindexRequest reindexRequest = new ReindexRequest();
+            reindexRequest.setSourceIndices(sourceIndex);
+            reindexRequest.setDestIndex(destinationIndex);
+            reindexRequest.setSourceQuery(new IdsQueryBuilder().addIds("1"));
+            reindexRequest.setRefresh(true);
+            reindexRequest.setRequireAlias(true);
+
+            OpenSearchStatusException exception = expectThrows(
+                OpenSearchStatusException.class,
+                () -> { execute(reindexRequest, highLevelClient()::reindex, highLevelClient()::reindexAsync); }
+            );
+            assertEquals(RestStatus.NOT_FOUND, exception.status());
+            assertEquals(
+                "OpenSearch exception [type=index_not_found_exception, reason=no such index [dest] and [require_alias] request flag is [true] and [dest] is not an alias]",
+                exception.getMessage()
+            );
+        }
     }
 
     public void testReindexTask() throws Exception {