[FLINK-2600] Enable test rerun for Elasticsearch Tests

This also bumps surefire/failsafe version to 2.8.1

flink-staging/flink-streaming/flink-streaming-connectors/flink-connector-elasticsearch/pom.xml

@@ -84,4 +84,23 @@ under the License.
 
     </dependencies>
 
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-surefire-plugin</artifactId>
+				<configuration>
+					<rerunFailingTestsCount>3</rerunFailingTestsCount>
+				</configuration>
+			</plugin>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-failsafe-plugin</artifactId>
+				<configuration>
+					<rerunFailingTestsCount>3</rerunFailingTestsCount>
+				</configuration>
+			</plugin>
+		</plugins>
+	</build>
+
 </project>

pom.xml

@@ -835,7 +835,7 @@ under the License.
 			</plugin>
 			<plugin>
 				<artifactId>maven-failsafe-plugin</artifactId>
-				<version>2.17</version><!--$NO-MVN-MAN-VER$-->
+				<version>2.18.1</version><!--$NO-MVN-MAN-VER$-->
 				<executions>
 					<execution>
 						<goals>
@@ -858,7 +858,7 @@ under the License.
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-surefire-plugin</artifactId>
-				<version>2.17</version><!--$NO-MVN-MAN-VER$-->
+				<version>2.18.1</version><!--$NO-MVN-MAN-VER$-->
 				<configuration>
 					<forkCount>${flink.forkCount}</forkCount>
 					<reuseForks>${flink.reuseForks}</reuseForks>