Support "default" for tcpNoDelay and tcpKeepAlive

Allow to set the value default to network.tcp.no_delay and network.tcp.keep_alive so they won't be set at all, since on solaris, setting tcpNoDelay can actually cause failure
relates to #7115

docs/reference/modules/network.asciidoc

@@ -72,10 +72,10 @@ share the following allowed settings:
 |=======================================================================
 |Setting |Description
 |`network.tcp.no_delay` |Enable or disable tcp no delay setting.
-Defaults to `true`.
+Defaults to `true`. coming[1.4,Can be set to `default` to not be set at all.]
 
-|`network.tcp.keep_alive` |Enable or disable tcp keep alive. By default
-not explicitly set.
+|`network.tcp.keep_alive` |Enable or disable tcp keep alive. Defaults
+to `true`. coming[1.4,Can be set to `default` to not be set at all].
 
 |`network.tcp.reuse_address` |Should an address be reused or not.
 Defaults to `true` on non-windows machines.

src/main/java/org/elasticsearch/http/netty/NettyHttpServerTransport.java

@@ -20,6 +20,7 @@
 package org.elasticsearch.http.netty;
 
 import org.elasticsearch.ElasticsearchException;
+import org.elasticsearch.common.Booleans;
 import org.elasticsearch.common.component.AbstractLifecycleComponent;
 import org.elasticsearch.common.inject.Inject;
 import org.elasticsearch.common.netty.NettyUtils;
@@ -88,10 +89,8 @@ public class NettyHttpServerTransport extends AbstractLifecycleComponent<HttpSer
 
     private final String publishHost;
 
-    private final Boolean tcpNoDelay;
-
-    private final Boolean tcpKeepAlive;
-
+    private final String tcpNoDelay;
+    private final String tcpKeepAlive;
     private final Boolean reuseAddress;
 
     private final ByteSizeValue tcpSendBufferSize;
@@ -135,8 +134,8 @@ public NettyHttpServerTransport(Settings settings, NetworkService networkService
         this.port = componentSettings.get("port", settings.get("http.port", "9200-9300"));
         this.bindHost = componentSettings.get("bind_host", settings.get("http.bind_host", settings.get("http.host")));
         this.publishHost = componentSettings.get("publish_host", settings.get("http.publish_host", settings.get("http.host")));
-        this.tcpNoDelay = componentSettings.getAsBoolean("tcp_no_delay", settings.getAsBoolean(TCP_NO_DELAY, true));
-        this.tcpKeepAlive = componentSettings.getAsBoolean("tcp_keep_alive", settings.getAsBoolean(TCP_KEEP_ALIVE, true));
+        this.tcpNoDelay = componentSettings.get("tcp_no_delay", settings.get(TCP_NO_DELAY, "true"));
+        this.tcpKeepAlive = componentSettings.get("tcp_keep_alive", settings.get(TCP_KEEP_ALIVE, "true"));
         this.reuseAddress = componentSettings.getAsBoolean("reuse_address", settings.getAsBoolean(TCP_REUSE_ADDRESS, NetworkUtils.defaultReuseAddress()));
         this.tcpSendBufferSize = componentSettings.getAsBytesSize("tcp_send_buffer_size", settings.getAsBytesSize(TCP_SEND_BUFFER_SIZE, TCP_DEFAULT_SEND_BUFFER_SIZE));
         this.tcpReceiveBufferSize = componentSettings.getAsBytesSize("tcp_receive_buffer_size", settings.getAsBytesSize(TCP_RECEIVE_BUFFER_SIZE, TCP_DEFAULT_RECEIVE_BUFFER_SIZE));
@@ -197,11 +196,11 @@ protected void doStart() throws ElasticsearchException {
 
         serverBootstrap.setPipelineFactory(configureServerChannelPipelineFactory());
 
-        if (tcpNoDelay != null) {
-            serverBootstrap.setOption("child.tcpNoDelay", tcpNoDelay);
+        if (!"default".equals(tcpNoDelay)) {
+            serverBootstrap.setOption("child.tcpNoDelay", Booleans.parseBoolean(tcpNoDelay, null));
         }
-        if (tcpKeepAlive != null) {
-            serverBootstrap.setOption("child.keepAlive", tcpKeepAlive);
+        if (!"default".equals(tcpKeepAlive)) {
+            serverBootstrap.setOption("child.keepAlive", Booleans.parseBoolean(tcpKeepAlive, null));
         }
         if (tcpSendBufferSize != null && tcpSendBufferSize.bytes() > 0) {
             serverBootstrap.setOption("child.sendBufferSize", tcpSendBufferSize.bytes());

src/main/java/org/elasticsearch/transport/netty/NettyTransport.java

@@ -23,6 +23,7 @@
 import com.google.common.collect.Lists;
 import org.elasticsearch.*;
 import org.elasticsearch.cluster.node.DiscoveryNode;
+import org.elasticsearch.common.Booleans;
 import org.elasticsearch.common.Strings;
 import org.elasticsearch.common.bytes.ReleasableBytesReference;
 import org.elasticsearch.common.component.AbstractLifecycleComponent;
@@ -128,11 +129,8 @@ public class NettyTransport extends AbstractLifecycleComponent<Transport> implem
     final boolean compress;
 
     final TimeValue connectTimeout;
-
-    final Boolean tcpNoDelay;
-
-    final Boolean tcpKeepAlive;
-
+    final String tcpNoDelay;
+    final String tcpKeepAlive;
     final Boolean reuseAddress;
 
     final ByteSizeValue tcpSendBufferSize;
@@ -196,8 +194,8 @@ public NettyTransport(Settings settings, ThreadPool threadPool, NetworkService n
         this.publishPort = componentSettings.getAsInt("publish_port", settings.getAsInt("transport.publish_port", 0));
         this.compress = settings.getAsBoolean(TransportSettings.TRANSPORT_TCP_COMPRESS, false);
         this.connectTimeout = componentSettings.getAsTime("connect_timeout", settings.getAsTime("transport.tcp.connect_timeout", settings.getAsTime(TCP_CONNECT_TIMEOUT, TCP_DEFAULT_CONNECT_TIMEOUT)));
-        this.tcpNoDelay = componentSettings.getAsBoolean("tcp_no_delay", settings.getAsBoolean(TCP_NO_DELAY, true));
-        this.tcpKeepAlive = componentSettings.getAsBoolean("tcp_keep_alive", settings.getAsBoolean(TCP_KEEP_ALIVE, true));
+        this.tcpNoDelay = componentSettings.get("tcp_no_delay", settings.get(TCP_NO_DELAY, "true"));
+        this.tcpKeepAlive = componentSettings.get("tcp_keep_alive", settings.get(TCP_KEEP_ALIVE, "true"));
         this.reuseAddress = componentSettings.getAsBoolean("reuse_address", settings.getAsBoolean(TCP_REUSE_ADDRESS, NetworkUtils.defaultReuseAddress()));
         this.tcpSendBufferSize = componentSettings.getAsBytesSize("tcp_send_buffer_size", settings.getAsBytesSize(TCP_SEND_BUFFER_SIZE, TCP_DEFAULT_SEND_BUFFER_SIZE));
         this.tcpReceiveBufferSize = componentSettings.getAsBytesSize("tcp_receive_buffer_size", settings.getAsBytesSize(TCP_RECEIVE_BUFFER_SIZE, TCP_DEFAULT_RECEIVE_BUFFER_SIZE));
@@ -271,11 +269,11 @@ protected void doStart() throws ElasticsearchException {
         }
         clientBootstrap.setPipelineFactory(configureClientChannelPipelineFactory());
         clientBootstrap.setOption("connectTimeoutMillis", connectTimeout.millis());
-        if (tcpNoDelay != null) {
-            clientBootstrap.setOption("tcpNoDelay", tcpNoDelay);
+        if (!"default".equals(tcpNoDelay)) {
+            clientBootstrap.setOption("tcpNoDelay", Booleans.parseBoolean(tcpNoDelay, null));
         }
-        if (tcpKeepAlive != null) {
-            clientBootstrap.setOption("keepAlive", tcpKeepAlive);
+        if (!"default".equals(tcpKeepAlive)) {
+            clientBootstrap.setOption("keepAlive", Booleans.parseBoolean(tcpKeepAlive, null));
         }
         if (tcpSendBufferSize != null && tcpSendBufferSize.bytes() > 0) {
             clientBootstrap.setOption("sendBufferSize", tcpSendBufferSize.bytes());
@@ -306,11 +304,11 @@ protected void doStart() throws ElasticsearchException {
                     workerCount));
         }
         serverBootstrap.setPipelineFactory(configureServerChannelPipelineFactory());
-        if (tcpNoDelay != null) {
-            serverBootstrap.setOption("child.tcpNoDelay", tcpNoDelay);
+        if (!"default".equals(tcpNoDelay)) {
+            serverBootstrap.setOption("child.tcpNoDelay", Booleans.parseBoolean(tcpNoDelay, null));
         }
-        if (tcpKeepAlive != null) {
-            serverBootstrap.setOption("child.keepAlive", tcpKeepAlive);
+        if (!"default".equals(tcpKeepAlive)) {
+            serverBootstrap.setOption("child.keepAlive", Booleans.parseBoolean(tcpKeepAlive, null));
         }
         if (tcpSendBufferSize != null && tcpSendBufferSize.bytes() > 0) {
             serverBootstrap.setOption("child.sendBufferSize", tcpSendBufferSize.bytes());