Addressing comments

Signed-off-by: Vacha Shah <vachshah@amazon.com>

java-client/src/main/java/org/opensearch/client/transport/aws/AwsSdk2Transport.java

@@ -297,7 +297,7 @@ public void close() {
     }
 
     @CheckForNull
-    public <RequestT> OpenSearchRequestBodyBuffer prepareRequestBody(
+    protected <RequestT> OpenSearchRequestBodyBuffer prepareRequestBody(
             RequestT request,
             Endpoint<RequestT, ?, ?> endpoint,
             TransportOptions options
@@ -321,7 +321,7 @@ public <RequestT> OpenSearchRequestBodyBuffer prepareRequestBody(
         return null;
     }
 
-    public <RequestT> SdkHttpFullRequest prepareRequest(
+    protected <RequestT> SdkHttpFullRequest prepareRequest(
             RequestT request,
             Endpoint<RequestT, ?, ?> endpoint,
             @CheckForNull TransportOptions options,

java-client/src/test/java/org/opensearch/client/opensearch/integTest/aws/AwsSdk2SearchIT.java

@@ -23,7 +23,6 @@
 import org.opensearch.client.opensearch.indices.CreateIndexResponse;
 import org.opensearch.client.opensearch.indices.OpenSearchIndicesClient;
 import org.opensearch.client.transport.JsonEndpoint;
-import org.opensearch.client.transport.aws.AwsSdk2Transport;
 import org.opensearch.client.util.OpenSearchRequestBodyBuffer;
 import software.amazon.awssdk.http.SdkHttpFullRequest;
 
@@ -162,7 +161,7 @@ public void testContentShaHeader() throws Exception {
         CreateIndexRequest request = new CreateIndexRequest.Builder().index(TEST_INDEX).build();
         JsonEndpoint<CreateIndexRequest, CreateIndexResponse, ErrorResponse> endpoint =
 				(JsonEndpoint<CreateIndexRequest, CreateIndexResponse, ErrorResponse>) CreateIndexRequest._ENDPOINT;
-        AwsSdk2Transport transport = new AwsSdk2Transport(
+        AwsSdk2TransportMock transport = new AwsSdk2TransportMock(
                     getHttpClient(),
                     getTestClusterHost(),
                     getTestClusterServiceName(),

java-client/src/test/java/org/opensearch/client/opensearch/integTest/aws/AwsSdk2TransportMock.java

@@ -0,0 +1,46 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+package org.opensearch.client.opensearch.integTest.aws;
+
+import org.opensearch.client.transport.Endpoint;
+import org.opensearch.client.transport.TransportOptions;
+import org.opensearch.client.transport.aws.AwsSdk2Transport;
+import org.opensearch.client.transport.aws.AwsSdk2TransportOptions;
+import org.opensearch.client.util.OpenSearchRequestBodyBuffer;
+import software.amazon.awssdk.http.SdkHttpClient;
+import software.amazon.awssdk.http.SdkHttpFullRequest;
+import software.amazon.awssdk.regions.Region;
+
+import java.io.IOException;
+
+import javax.annotation.CheckForNull;
+import javax.annotation.Nonnull;
+
+public class AwsSdk2TransportMock extends AwsSdk2Transport {
+
+    public AwsSdk2TransportMock(
+            @Nonnull SdkHttpClient httpClient,
+            @Nonnull String host,
+            @Nonnull String signingServiceName,
+            @Nonnull Region signingRegion,
+            @CheckForNull AwsSdk2TransportOptions options) {
+        super(httpClient, host, signingServiceName, signingRegion, options);
+    }
+
+    @Override
+    public <RequestT> OpenSearchRequestBodyBuffer prepareRequestBody(RequestT request,
+            Endpoint<RequestT, ?, ?> endpoint, TransportOptions options) throws IOException {
+        return super.prepareRequestBody(request, endpoint, options);
+    }
+    @Override
+    public <RequestT> SdkHttpFullRequest prepareRequest(RequestT request, Endpoint<RequestT, ?, ?> endpoint,
+            TransportOptions options, OpenSearchRequestBodyBuffer body) {
+        return super.prepareRequest(request, endpoint, options, body);
+    }
+}