Try to make Jest auto-configuration tests more robust

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/elasticsearch/jest/JestAutoConfigurationTests.java

@@ -147,6 +147,14 @@ public class JestAutoConfigurationTests {
 	}
 
 	private JestResult execute(JestClient client, Action<? extends JestResult> action) {
+		for (int i = 0; i < 2; i++) {
+			try {
+				return client.execute(action);
+			}
+			catch (IOException ex) {
+				// Continue
+			}
+		}
 		try {
 			return client.execute(action);
 		}