Change query in MongoHealthIndicator

This commit changes the query in MongoHealthIndicator from serverStatus to buildInfo to avoid unprivileged access and corresponding errors.

fixes #1289

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/health/MongoHealthIndicator.java

@@ -39,7 +39,7 @@ public class MongoHealthIndicator extends AbstractHealthIndicator {
 
 	@Override
 	protected void doHealthCheck(Health.Builder builder) throws Exception {
-		CommandResult result = this.mongoTemplate.executeCommand("{ serverStatus: 1 }");
+		CommandResult result = this.mongoTemplate.executeCommand("{ buildInfo: 1 }");
 		builder.up().withDetail("version", result.getString("version"));
 	}
 

spring-boot-actuator/src/test/java/org/springframework/boot/actuate/health/MongoHealthIndicatorTests.java

@@ -67,7 +67,7 @@ public class MongoHealthIndicatorTests {
 		CommandResult commandResult = Mockito.mock(CommandResult.class);
 		Mockito.when(commandResult.getString("version")).thenReturn("2.6.4");
 		MongoTemplate mongoTemplate = Mockito.mock(MongoTemplate.class);
-		Mockito.when(mongoTemplate.executeCommand("{ serverStatus: 1 }")).thenReturn(
+		Mockito.when(mongoTemplate.executeCommand("{ buildInfo: 1 }")).thenReturn(
 				commandResult);
 		MongoHealthIndicator healthIndicator = new MongoHealthIndicator(mongoTemplate);
 
@@ -76,13 +76,13 @@ public class MongoHealthIndicatorTests {
 		assertEquals("2.6.4", health.getDetails().get("version"));
 
 		Mockito.verify(commandResult).getString("version");
-		Mockito.verify(mongoTemplate).executeCommand("{ serverStatus: 1 }");
+		Mockito.verify(mongoTemplate).executeCommand("{ buildInfo: 1 }");
 	}
 
 	@Test
 	public void mongoIsDown() throws Exception {
 		MongoTemplate mongoTemplate = Mockito.mock(MongoTemplate.class);
-		Mockito.when(mongoTemplate.executeCommand("{ serverStatus: 1 }")).thenThrow(
+		Mockito.when(mongoTemplate.executeCommand("{ buildInfo: 1 }")).thenThrow(
 				new MongoException("Connection failed"));
 		MongoHealthIndicator healthIndicator = new MongoHealthIndicator(mongoTemplate);
 
@@ -91,6 +91,6 @@ public class MongoHealthIndicatorTests {
 		assertTrue(((String) health.getDetails().get("error"))
 				.contains("Connection failed"));
 
-		Mockito.verify(mongoTemplate).executeCommand("{ serverStatus: 1 }");
+		Mockito.verify(mongoTemplate).executeCommand("{ buildInfo: 1 }");
 	}
 }