diff --git a/src/main/java/org/elasticsearch/threadpool/ThreadPool.java b/src/main/java/org/elasticsearch/threadpool/ThreadPool.java
index ebfc751a942..12a7853ac84 100644
--- a/src/main/java/org/elasticsearch/threadpool/ThreadPool.java
+++ b/src/main/java/org/elasticsearch/threadpool/ThreadPool.java
@@ -139,17 +139,19 @@ public class ThreadPool extends AbstractComponent {
             int queue = -1;
             int active = -1;
             long rejected = -1;
+            int largest = -1;
             if (holder.executor instanceof ThreadPoolExecutor) {
                 ThreadPoolExecutor threadPoolExecutor = (ThreadPoolExecutor) holder.executor;
                 threads = threadPoolExecutor.getPoolSize();
                 queue = threadPoolExecutor.getQueue().size();
                 active = threadPoolExecutor.getActiveCount();
+                largest = threadPoolExecutor.getLargestPoolSize();
                 RejectedExecutionHandler rejectedExecutionHandler = threadPoolExecutor.getRejectedExecutionHandler();
                 if (rejectedExecutionHandler instanceof XRejectedExecutionHandler) {
                     rejected = ((XRejectedExecutionHandler) rejectedExecutionHandler).rejected();
                 }
             }
-            stats.add(new ThreadPoolStats.Stats(name, threads, queue, active, rejected));
+            stats.add(new ThreadPoolStats.Stats(name, threads, queue, active, rejected, largest));
         }
         return new ThreadPoolStats(stats);
     }
diff --git a/src/main/java/org/elasticsearch/threadpool/ThreadPoolStats.java b/src/main/java/org/elasticsearch/threadpool/ThreadPoolStats.java
index 929860a2985..11e6b356c0f 100644
--- a/src/main/java/org/elasticsearch/threadpool/ThreadPoolStats.java
+++ b/src/main/java/org/elasticsearch/threadpool/ThreadPoolStats.java
@@ -42,17 +42,19 @@ public class ThreadPoolStats implements Streamable, ToXContent, Iterable<ThreadP
         private int queue;
         private int active;
         private long rejected;
+        private int largest;
 
         Stats() {
 
         }
 
-        public Stats(String name, int threads, int queue, int active, long rejected) {
+        public Stats(String name, int threads, int queue, int active, long rejected, int largest) {
             this.name = name;
             this.threads = threads;
             this.queue = queue;
             this.active = active;
             this.rejected = rejected;
+            this.largest = largest;
         }
 
         public String name() {
@@ -95,22 +97,32 @@ public class ThreadPoolStats implements Streamable, ToXContent, Iterable<ThreadP
             return rejected;
         }
 
+        public int largest() {
+            return largest;
+        }
+
+        public int getLargest() {
+            return largest;
+        }
+
         @Override
         public void readFrom(StreamInput in) throws IOException {
-            name = in.readUTF();
+            name = in.readString();
             threads = in.readInt();
             queue = in.readInt();
             active = in.readInt();
             rejected = in.readLong();
+            largest = in.readInt();
         }
 
         @Override
         public void writeTo(StreamOutput out) throws IOException {
-            out.writeUTF(name);
+            out.writeString(name);
             out.writeInt(threads);
             out.writeInt(queue);
             out.writeInt(active);
             out.writeLong(rejected);
+            out.writeInt(largest);
         }
 
         @Override
@@ -128,6 +140,9 @@ public class ThreadPoolStats implements Streamable, ToXContent, Iterable<ThreadP
             if (rejected != -1) {
                 builder.field(Fields.REJECTED, rejected);
             }
+            if (largest != -1) {
+                builder.field(Fields.LARGEST, rejected);
+            }
             builder.endObject();
             return builder;
         }
@@ -179,6 +194,7 @@ public class ThreadPoolStats implements Streamable, ToXContent, Iterable<ThreadP
         static final XContentBuilderString QUEUE = new XContentBuilderString("queue");
         static final XContentBuilderString ACTIVE = new XContentBuilderString("active");
         static final XContentBuilderString REJECTED = new XContentBuilderString("rejected");
+        static final XContentBuilderString LARGEST = new XContentBuilderString("largest");
     }
 
     @Override