Because of the lack of Update, S3 Bucket Object needs to force new when changing the params

builtin/providers/aws/resource_aws_s3_bucket_object.go

@@ -28,26 +28,31 @@ func resourceAwsS3BucketObject() *schema.Resource {
 			"cache_control": &schema.Schema{
 				Type:     schema.TypeString,
 				Optional: true,
+				ForceNew: true,
 			},
 
 			"content_disposition": &schema.Schema{
 				Type:     schema.TypeString,
 				Optional: true,
+				ForceNew: true,
 			},
 
 			"content_encoding": &schema.Schema{
 				Type:     schema.TypeString,
 				Optional: true,
+				ForceNew: true,
 			},
 
 			"content_language": &schema.Schema{
 				Type:     schema.TypeString,
 				Optional: true,
+				ForceNew: true,
 			},
 
 			"content_type": &schema.Schema{
 				Type:     schema.TypeString,
 				Optional: true,
+				ForceNew: true,
 			},
 
 			"key": &schema.Schema{