Fixed up measure_latency option in r53 health checks.

* Added ignoring of param when Type is CALCULATED
* Added ForceNew param to measure_latency item in schema
* Added check to test

builtin/providers/aws/resource_aws_route53_health_check.go

@@ -59,6 +59,7 @@ func resourceAwsRoute53HealthCheck() *schema.Resource {
 				Type:     schema.TypeBool,
 				Optional: true,
 				Default:  false,
+				ForceNew: true,
 			},
 			"tags": tagsSchema(),
 		},
@@ -133,9 +134,11 @@ func resourceAwsRoute53HealthCheckCreate(d *schema.ResourceData, meta interface{
 		healthConfig.ResourcePath = aws.String(v.(string))
 	}
 
+	if *healthConfig.Type != route53.HealthCheckTypeCalculated {
 		if v, ok := d.GetOk("measure_latency"); ok {
 			healthConfig.MeasureLatency = aws.Bool(v.(bool))
 		}
+	}
 
 	input := &route53.CreateHealthCheckInput{
 		CallerReference:   aws.String(time.Now().Format(time.RFC3339Nano)),

builtin/providers/aws/resource_aws_route53_health_check_test.go

@@ -20,6 +20,8 @@ func TestAccAWSRoute53HealthCheck_basic(t *testing.T) {
 				Config: testAccRoute53HealthCheckConfig,
 				Check: resource.ComposeTestCheckFunc(
 					testAccCheckRoute53HealthCheckExists("aws_route53_health_check.foo"),
+					resource.TestCheckResourceAttr(
+						"aws_route53_health_check.foo", "measure_latency", "true"),
 				),
 			},
 			resource.TestStep{