Remove HTTP_CHANNEL_KEY attributes since it is now available from the…

… base class (#2130)

Signed-off-by: Andriy Redko <[email protected]>

src/main/java/org/opensearch/security/ssl/http/netty/SecuritySSLNettyHttpServerTransport.java

@@ -24,7 +24,6 @@
 import io.netty.handler.ssl.ApplicationProtocolNames;
 import io.netty.handler.ssl.ApplicationProtocolNegotiationHandler;
 import io.netty.handler.ssl.SslHandler;
-import io.netty.util.AttributeKey;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
@@ -43,8 +42,6 @@
 import org.opensearch.transport.SharedGroupFactory;
 
 public class SecuritySSLNettyHttpServerTransport extends Netty4HttpServerTransport {
-    static final AttributeKey<Netty4HttpChannel> HTTP_CHANNEL_KEY = AttributeKey.valueOf("opensearch-http-channel");
-
     private static final Logger logger = LogManager.getLogger(SecuritySSLNettyHttpServerTransport.class);
     private final SecurityKeyStore sks;
     private final SslExceptionHandler errorHandler;