Release pipelined request in netty server tests (#32368)

The Netty4HttpServerPipeliningTests adds a different request handler to
the netty pipeline. This request does not properly release pipelined
request. This means that when we enable leak detection, the test fails.
This commit properly releases the request.

Author: Tim-Brooks

modules/transport-netty4/src/test/java/org/elasticsearch/http/netty4/Netty4HttpServerPipeliningTests.java

@@ -33,7 +33,6 @@
 import io.netty.handler.codec.http.HttpResponseStatus;
 import io.netty.handler.codec.http.HttpVersion;
 import io.netty.util.ReferenceCounted;
-import org.apache.lucene.util.LuceneTestCase.AwaitsFix;
 import org.elasticsearch.common.network.NetworkService;
 import org.elasticsearch.common.settings.Setting;
 import org.elasticsearch.common.settings.Settings;
@@ -122,7 +121,6 @@ public void testThatHttpPipeliningWorksWhenEnabled() throws Exception {
         assertSettingDeprecationsAndWarnings(new Setting<?>[] {HttpTransportSettings.SETTING_PIPELINING});
     }
 
-    @AwaitsFix(bugUrl="https://github.com/elastic/elasticsearch/issues/32900")
     public void testThatHttpPipeliningCanBeDisabled() throws Exception {
         final Settings settings = Settings.builder()
             .put("http.pipelining", false)
@@ -261,8 +259,7 @@ public void run() {
 
                 final ByteBuf buffer = Unpooled.copiedBuffer(uri, StandardCharsets.UTF_8);
 
-                final DefaultFullHttpResponse httpResponse =
-                    new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK, buffer);
+                final FullHttpResponse httpResponse = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK, buffer);
                 httpResponse.headers().add(HttpHeaderNames.CONTENT_LENGTH, buffer.readableBytes());
 
                 final boolean slow = uri.matches("/slow/\\d+");
@@ -284,10 +281,7 @@ public void run() {
                     msg = httpResponse;
                 }
                 ctx.writeAndFlush(msg, promise);
-            }  finally {
-                if (fullHttpRequest != null) {
-                    fullHttpRequest.release();
-                }
+            } finally {
                 if (pipelinedRequest != null) {
                     pipelinedRequest.release();
                 }