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Netty 4 based transport implementation

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/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0 and the Server Side Public License, v 1; you may not use this file except
 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */

package org.elasticsearch.http.netty4;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToMessageEncoder;
import io.netty.handler.codec.compression.JdkZlibEncoder;
import io.netty.handler.codec.http.DefaultHttpContent;
import io.netty.handler.codec.http.DefaultHttpResponse;
import io.netty.handler.codec.http.DefaultLastHttpContent;
import io.netty.handler.codec.http.HttpResponse;

import org.elasticsearch.core.Booleans;
import org.elasticsearch.transport.NettyAllocator;

import java.util.List;

/**
 * Split up large responses to prevent batch compression {@link JdkZlibEncoder} down the pipeline.
 */
@ChannelHandler.Sharable
class Netty4HttpResponseCreator extends MessageToMessageEncoder {

    private static final String DO_NOT_SPLIT = "es.unsafe.do_not_split_http_responses";

    private static final boolean DO_NOT_SPLIT_HTTP_RESPONSES;
    private static final int SPLIT_THRESHOLD;

    static {
        DO_NOT_SPLIT_HTTP_RESPONSES = Booleans.parseBoolean(System.getProperty(DO_NOT_SPLIT), false);
        // Netty will add some header bytes if it compresses this message. So we downsize slightly.
        SPLIT_THRESHOLD = (int) (NettyAllocator.suggestedMaxAllocationSize() * 0.99);
    }

    @Override
    protected void encode(ChannelHandlerContext ctx, Netty4HttpResponse msg, List