Decrement reference even if IndexShard#postRecovery barfs

This can cause a reference leak if we call `IndexShard#postRecovery`
on an already closed shard.

src/main/java/org/elasticsearch/indices/recovery/RecoveryStatus.java

@@ -188,12 +188,15 @@ public class RecoveryStatus extends AbstractRefCounted {
     public void markAsDone() {
         if (finished.compareAndSet(false, true)) {
             assert tempFileNames.isEmpty() : "not all temporary files are renamed";
+            try {
                 indexShard.postRecovery("peer recovery done");
+            } finally {
                 // release the initial reference. recovery files will be cleaned as soon as ref count goes to zero, potentially now
                 decRef();
                 listener.onRecoveryDone(state());
             }
         }
+    }
 
     /** Get a temporary name for the provided file name. */
     public String getTempNameForFile(String origFile) {