+per #13944 Send RecoveryComplete message at end of recovery

Fixes #13944

Conflicts:
	akka-docs/rst/scala/code/docs/persistence/PersistenceDocSpec.scala
	akka-persistence/src/main/scala/akka/persistence/Processor.scala
	project/AkkaBuild.scala

akka-docs/rst/java/code/docs/persistence/PersistenceDocTest.java

@@ -19,6 +19,8 @@ import static java.util.Arrays.asList;
 
 public class PersistenceDocTest {
 
+    public interface SomeOtherMessage {}
+
     public interface ProcessorMethods {
         //#processor-id
         public String processorId();
@@ -49,9 +51,12 @@ public class PersistenceDocTest {
                     Long sequenceNr = failure.sequenceNr();
                     Throwable cause = failure.cause();
                     // ...
-                } else {
+                } else if (message instanceof SomeOtherMessage) {
                     // message not written to journal
                 }
+                else {
+                    unhandled(message);
+                }
             }
         }
         //#definition
@@ -127,21 +132,12 @@ public class PersistenceDocTest {
         
         class MyProcessor5 extends UntypedProcessor {
             //#recovery-completed
-            @Override
-            public void preStart() throws Exception {
-                super.preStart();
-                self().tell("FIRST", self());
-            }
-            
             public void onReceive(Object message) throws Exception {
-                if (message.equals("FIRST")) {
+                if (message instanceof RecoveryCompleted) {
                     recoveryCompleted();
                     getContext().become(active);
-                    unstashAll();
-                } else if (recoveryFinished()) {
-                    stash(); 
                 } else {
-                    active.apply(message);  
+                    unhandled(message);
                 }
             }
             
@@ -156,6 +152,9 @@ public class PersistenceDocTest {
                 if (message instanceof Persistent) {
                     // ...
                 }
+                else {
+                    unhandled(message);
+                }
               }
             };
             //#recovery-completed