Update App name

Author: Satendra kumar

src/main/java/com/es/app/App.java renamed to src/main/java/com/es/app/ESApp.java

@@ -9,7 +9,7 @@
 import org.elasticsearch.client.Client;
 
 
-public class App {
+public class ESApp {
 
     public static void main(String[] args) {
         ESManager esManager = new ESManager();

src/test/java/com/es/app/AppTest.java

@@ -5,7 +5,7 @@
 import junit.framework.TestSuite;
 
 /**
- * Unit test for simple App.
+ * Unit test for simple ESApp.
  */
 public class AppTest 
     extends TestCase