From c9d874da79ef44d5946a8684a9e13b001a0427ea Mon Sep 17 00:00:00 2001
From: "opensearch-trigger-bot[bot]"
 <98922864+opensearch-trigger-bot[bot]@users.noreply.github.com>
Date: Fri, 5 Apr 2024 18:18:17 -0400
Subject: [PATCH] Client with Java 8 runtime and Apache HttpClient 5 Transport
 fails with java.lang.NoSuchMethodError:
 java.nio.ByteBuffer.flip()Ljava/nio/ByteBuffer (#920) (#921)

(cherry picked from commit 0db2215c54f98e7b76c9cf4e1dd27056fd415c3d)

Signed-off-by: Andriy Redko <andriy.redko@aiven.io>
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
---
 CHANGELOG.md                                                   | 1 +
 .../httpclient5/internal/HttpEntityAsyncEntityProducer.java    | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 80475fbde6..b1231c850d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -26,6 +26,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Fix integer overflow for variables in indices stats response ([#877](https://github.com/opensearch-project/opensearch-java/pull/877))
 - Support weight function in function score query ([#880](https://github.com/opensearch-project/opensearch-java/pull/880))
 - Fix pattern replace by making flag and replacement optional as on api  ([#895](https://github.com/opensearch-project/opensearch-java/pull/895))
+- Client with Java 8 runtime and Apache HttpClient 5 Transport fails with java.lang.NoSuchMethodError: java.nio.ByteBuffer.flip()Ljava/nio/ByteBuffer ([#920](https://github.com/opensearch-project/opensearch-java/pull/920)) 
 
 ### Security
 
diff --git a/java-client/src/main/java/org/opensearch/client/transport/httpclient5/internal/HttpEntityAsyncEntityProducer.java b/java-client/src/main/java/org/opensearch/client/transport/httpclient5/internal/HttpEntityAsyncEntityProducer.java
index 2713f6182a..d788f8127f 100644
--- a/java-client/src/main/java/org/opensearch/client/transport/httpclient5/internal/HttpEntityAsyncEntityProducer.java
+++ b/java-client/src/main/java/org/opensearch/client/transport/httpclient5/internal/HttpEntityAsyncEntityProducer.java
@@ -9,6 +9,7 @@
 package org.opensearch.client.transport.httpclient5.internal;
 
 import java.io.IOException;
+import java.nio.Buffer;
 import java.nio.ByteBuffer;
 import java.nio.channels.Channels;
 import java.nio.channels.ReadableByteChannel;
@@ -140,7 +141,7 @@ public void produce(final DataStreamChannel channel) throws IOException {
             }
         }
         if (byteBuffer.position() > 0) {
-            byteBuffer.flip();
+            ((Buffer) byteBuffer).flip();
             channel.write(byteBuffer);
             byteBuffer.compact();
         }