Resolve Redis Client Connection Issue in Integration Test

- Resolves a race condition where a client instance is closed
  before it can be used by another test

persistence-modules/redis/src/main/java/com/baeldung/redis_scan/client/RedisClient.java

@@ -145,5 +145,10 @@ public class RedisClient {
             log.error("Exception caught in flushAll", ex);
         }
     }
+    
+    public void destroyInstance() {
+        jedisPool = null;
+        instance = null;
+    }
 
 }