Cleanup o/e/c/u/c/EsExecutors.java

This commit removes two unused imports and applies a few other
formatting cleanups to EsExecutors.java.

core/src/main/java/org/elasticsearch/common/util/concurrent/EsExecutors.java

@@ -25,18 +25,13 @@ import org.elasticsearch.common.settings.Settings;
 
 import java.util.Arrays;
 import java.util.concurrent.BlockingQueue;
-import java.util.concurrent.LinkedBlockingQueue;
 import java.util.concurrent.LinkedTransferQueue;
-import java.util.concurrent.SynchronousQueue;
 import java.util.concurrent.ThreadFactory;
 import java.util.concurrent.ThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.stream.Collectors;
 
-/**
- *
- */
 public class EsExecutors {
 
     /**
@@ -110,6 +105,7 @@ public class EsExecutors {
     }
 
     static class EsThreadFactory implements ThreadFactory {
+
         final ThreadGroup group;
         final AtomicInteger threadNumber = new AtomicInteger(1);
         final String namePrefix;
@@ -129,6 +125,7 @@ public class EsExecutors {
             t.setDaemon(true);
             return t;
         }
+
     }
 
     /**
@@ -137,7 +134,6 @@ public class EsExecutors {
     private EsExecutors() {
     }
 
-
     static class ExecutorScalingQueue<E> extends LinkedTransferQueue<E> {
 
         ThreadPoolExecutor executor;
@@ -166,6 +162,7 @@ public class EsExecutors {
                 return true;
             }
         }
+
     }
 
     /**
@@ -188,4 +185,5 @@ public class EsExecutors {
             return 0;
         }
     }
+
 }