cleamup ShardIter#reset method

don't have teh reset method return an instance, as it might confuse usage into thinking it might be a different instance

src/main/java/org/elasticsearch/cluster/routing/PlainShardIterator.java

@@ -56,12 +56,6 @@ public class PlainShardIterator extends PlainShardsIterator implements ShardIter
         this.shardId = shardId;
     }
 
-    @Override
-    public ShardIterator reset() {
-        super.reset();
-        return this;
-    }
-
     @Override
     public ShardId shardId() {
         return this.shardId;

src/main/java/org/elasticsearch/cluster/routing/PlainShardsIterator.java

@@ -54,9 +54,8 @@ public class PlainShardsIterator implements ShardsIterator {
     }
 
     @Override
-    public ShardsIterator reset() {
+    public void reset() {
         this.counter = this.index;
-        return this;
     }
 
     @Override

src/main/java/org/elasticsearch/cluster/routing/ShardIterator.java

@@ -34,5 +34,5 @@ public interface ShardIterator extends ShardsIterator {
     /**
      * Resets the iterator.
      */
-    ShardIterator reset();
+    void reset();
 }

src/main/java/org/elasticsearch/cluster/routing/ShardsIterator.java

@@ -27,16 +27,18 @@ public interface ShardsIterator {
     /**
      * Resets the iterator to its initial state.
      */
-    ShardsIterator reset();
+    void reset();
 
     /**
      * The number of shard routing instances.
+     *
      * @return number of shard routing instances in this iterator
      */
     int size();
 
     /**
      * The number of active shard routing instances
+     *
      * @return number of active shard routing instances
      */
     int sizeActive();
@@ -63,6 +65,7 @@ public interface ShardsIterator {
 
     /**
      * Return the number of shards remaining in this {@link ShardsIterator}
+     *
      * @return number of shard remaining
      */
     int remaining();