diff --git a/core/src/main/java/org/elasticsearch/action/admin/cluster/node/info/NodeInfo.java b/core/src/main/java/org/elasticsearch/action/admin/cluster/node/info/NodeInfo.java
index 68ec0f39e6d..d697236472f 100644
--- a/core/src/main/java/org/elasticsearch/action/admin/cluster/node/info/NodeInfo.java
+++ b/core/src/main/java/org/elasticsearch/action/admin/cluster/node/info/NodeInfo.java
@@ -211,7 +211,7 @@ public class NodeInfo extends BaseNodeResponse {
             jvm = new JvmInfo(in);
         }
         if (in.readBoolean()) {
-            threadPool = ThreadPoolInfo.readThreadPoolInfo(in);
+            threadPool = new ThreadPoolInfo(in);
         }
         if (in.readBoolean()) {
             transport = TransportInfo.readTransportInfo(in);
diff --git a/core/src/main/java/org/elasticsearch/threadpool/ThreadPoolInfo.java b/core/src/main/java/org/elasticsearch/threadpool/ThreadPoolInfo.java
index 729c6cb7364..5b9dadc85ec 100644
--- a/core/src/main/java/org/elasticsearch/threadpool/ThreadPoolInfo.java
+++ b/core/src/main/java/org/elasticsearch/threadpool/ThreadPoolInfo.java
@@ -21,49 +21,33 @@ package org.elasticsearch.threadpool;
 
 import org.elasticsearch.common.io.stream.StreamInput;
 import org.elasticsearch.common.io.stream.StreamOutput;
-import org.elasticsearch.common.io.stream.Streamable;
+import org.elasticsearch.common.io.stream.Writeable;
 import org.elasticsearch.common.xcontent.ToXContent;
 import org.elasticsearch.common.xcontent.XContentBuilder;
 
 import java.io.IOException;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.Iterator;
 import java.util.List;
 
-/**
- */
-public class ThreadPoolInfo implements Streamable, Iterable<ThreadPool.Info>, ToXContent {
-
-    private List<ThreadPool.Info> infos;
-
-    ThreadPoolInfo() {
-    }
+public class ThreadPoolInfo implements Writeable, Iterable<ThreadPool.Info>, ToXContent {
 
+    private final List<ThreadPool.Info> infos;
 
     public ThreadPoolInfo(List<ThreadPool.Info> infos) {
-        this.infos = infos;
+        this.infos = Collections.unmodifiableList(infos);
     }
 
-    @Override
-    public Iterator<ThreadPool.Info> iterator() {
-        return infos.iterator();
-    }
-
-    public static ThreadPoolInfo readThreadPoolInfo(StreamInput in) throws IOException {
-        ThreadPoolInfo info = new ThreadPoolInfo();
-        info.readFrom(in);
-        return info;
-    }
-
-    @Override
-    public void readFrom(StreamInput in) throws IOException {
+    public ThreadPoolInfo(StreamInput in) throws IOException {
         int size = in.readVInt();
-        infos = new ArrayList<>(size);
+        List<ThreadPool.Info> infos = new ArrayList<>(size);
         for (int i = 0; i < size; i++) {
             ThreadPool.Info info = new ThreadPool.Info();
             info.readFrom(in);
             infos.add(info);
         }
+        this.infos = Collections.unmodifiableList(infos);
     }
 
     @Override
@@ -74,6 +58,11 @@ public class ThreadPoolInfo implements Streamable, Iterable<ThreadPool.Info>, To
         }
     }
 
+    @Override
+    public Iterator<ThreadPool.Info> iterator() {
+        return infos.iterator();
+    }
+
     static final class Fields {
         static final String THREAD_POOL = "thread_pool";
     }