Fix misleading S3 Lifecycle rule warning

Author: johannes-gehrs

.changelog/43590.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+resource/aws_s3_bucket_lifecycle_configuration: Do not warn if no filter element is set
+```

internal/service/s3/bucket_lifecycle_configuration.go

@@ -110,12 +110,6 @@ func (r *bucketLifecycleConfigurationResource) Schema(ctx context.Context, reque
 					listvalidator.SizeAtLeast(1),
 				},
 				NestedObject: schema.NestedBlockObject{
-					Validators: []validator.Object{
-						tfobjectvalidator.WarnExactlyOneOfChildren(
-							path.MatchRelative().AtName(names.AttrFilter),
-							path.MatchRelative().AtName(names.AttrPrefix),
-						),
-					},
 					Attributes: map[string]schema.Attribute{
 						names.AttrID: schema.StringAttribute{
 							Required: true,

website/docs/r/s3_bucket_lifecycle_configuration.html.markdown

@@ -28,7 +28,7 @@ See the Amazon S3 User Guide on [setting lifecycle configuration on a bucket](ht
 
 ### With neither a filter nor prefix specified
 
-The Lifecycle rule applies to a subset of objects based on the key name prefix (`""`).
+The Lifecycle rule applies to all objects in the bucket, i.e. it is equivalent to setting an empty `filter` element.
 
 This configuration is intended to replicate the default behavior of the `lifecycle_rule`
 parameter in the Terraform AWS Provider `aws_s3_bucket` resource prior to `v4.0`.
@@ -384,16 +384,12 @@ The `rule` configuration block supports the following arguments:
 * `expiration` - (Optional) Configuration block that specifies the expiration for the lifecycle of the object in the form of date, days and, whether the object has a delete marker. [See below](#expiration).
 * `filter` - (Optional) Configuration block used to identify objects that a Lifecycle Rule applies to.
   [See below](#filter).
-  If not specified, the `rule` will default to using `prefix`.
-  One of `filter` or `prefix` should be specified.
 * `id` - (Required) Unique identifier for the rule. The value cannot be longer than 255 characters.
 * `noncurrent_version_expiration` - (Optional) Configuration block that specifies when noncurrent object versions expire. [See below](#noncurrent_version_expiration).
 * `noncurrent_version_transition` - (Optional) Set of configuration blocks that specify the transition rule for the lifecycle rule that describes when noncurrent objects transition to a specific storage class. [See below](#noncurrent_version_transition).
 * `prefix` - (Optional) **DEPRECATED** Use `filter` instead.
   This has been deprecated by Amazon S3.
   Prefix identifying one or more objects to which the rule applies.
-  Defaults to an empty string (`""`) if `filter` is not specified.
-  One of `prefix` or `filter` should be specified.
 * `status` - (Required) Whether the rule is currently being applied. Valid values: `Enabled` or `Disabled`.
 * `transition` - (Optional) Set of configuration blocks that specify when an Amazon S3 object transitions to a specified storage class. [See below](#transition).