revert instance reference

Author: s-soroosh

samples/pure-java/src/main/java/io/javaoperatorsdk/operator/sample/PureJavaApplicationRunner.java

@@ -1,19 +1,15 @@
 package io.javaoperatorsdk.operator.sample;
 
-import java.util.concurrent.atomic.LongAccumulator;
+import io.fabric8.kubernetes.client.DefaultKubernetesClient;
+import io.fabric8.kubernetes.client.KubernetesClient;
+import io.javaoperatorsdk.operator.Operator;
+import io.javaoperatorsdk.operator.config.runtime.DefaultConfigurationService;
 
 public class PureJavaApplicationRunner {
 
   public static void main(String[] args) {
-    //    KubernetesClient client = new DefaultKubernetesClient();
-    //    Operator operator = new Operator(client, DefaultConfigurationService.INSTANCE);
-    //    operator.registerController(new CustomServiceController(client));
-
-    final var acc = new LongAccumulator(Long::min, Integer.MAX_VALUE);
-    acc.accumulate(10);
-    acc.accumulate(20);
-    acc.accumulate(90);
-
-    System.out.println(acc.get());
+    KubernetesClient client = new DefaultKubernetesClient();
+    Operator operator = new Operator(client, DefaultConfigurationService.instance());
+    operator.registerController(new CustomServiceController(client));
   }
 }