Merge pull request hashicorp#2161 from terraform-providers/paddy_bigtable_clusters

Move Bigtable config to cluster block.

Author: paddycarver

docs/r/bigtable_instance.html.markdown

@@ -18,10 +18,12 @@ Creates a Google Bigtable instance. For more information see
 ```hcl
 resource "google_bigtable_instance" "instance" {
   name         = "tf-instance"
-  cluster_id   = "tf-instance-cluster"
-  zone         = "us-central1-b"
-  num_nodes    = 3
-  storage_type = "HDD"
+  cluster {
+    cluster_id   = "tf-instance-cluster"
+    zone         = "us-central1-b"
+    num_nodes    = 3
+    storage_type = "HDD"
+  }
 }
 ```
 
@@ -31,21 +33,35 @@ The following arguments are supported:
 
 * `name` - (Required) The name of the Cloud Bigtable instance.
 
-* `cluster_id` - (Required) The ID of the Cloud Bigtable cluster.
-
-* `zone` - (Required) The zone to create the Cloud Bigtable cluster in. Zones that support Bigtable instances are noted on the [Cloud Bigtable locations page](https://cloud.google.com/bigtable/docs/locations).
-
-* `num_nodes` - (Optional) The number of nodes in your Cloud Bigtable cluster. Minimum of `3` for a `PRODUCTION` instance. Cannot be set for a `DEVELOPMENT` instance.
-
 * `instance_type` - (Optional) The instance type to create. One of `"DEVELOPMENT"` or `"PRODUCTION"`. Defaults to `"PRODUCTION"`.
 
-* `storage_type` - (Optional) The storage type to use. One of `"SSD"` or `"HDD"`. Defaults to `"SSD"`.
-
 * `project` - (Optional) The ID of the project in which the resource belongs. If it
     is not provided, the provider project is used.
 
 * `display_name` - (Optional) The human-readable display name of the Bigtable instance. Defaults to the instance `name`.
 
+* `cluster` - (Optional) A block of cluster configuration options. Either `cluster` or `cluster_id` must be used. Only one cluster may be specified. See structure below.
+
+* `cluster_id` - (Optional, Deprecated) The ID of the Cloud Bigtable cluster. Use `cluster.cluster_id` instead.
+
+* `zone` - (Optional, Deprecated) The zone to create the Cloud Bigtable cluster in. Zones that support Bigtable instances are noted on the [Cloud Bigtable locations page](https://cloud.google.com/bigtable/docs/locations). Use `cluster.zone` instead.
+
+* `num_nodes` - (Optional, Deprecated) The number of nodes in your Cloud Bigtable cluster. Minimum of `3` for a `PRODUCTION` instance. Cannot be set for a `DEVELOPMENT` instance. Use `cluster.num_nodes` instead.
+
+* `storage_type` - (Optional, Deprecated) The storage type to use. One of `"SSD"` or `"HDD"`. Defaults to `"SSD"`. Use `cluster.storage_type` instead.
+
+-----
+
+`cluster` supports the following arguments:
+
+* `cluster_id` - (Required) The ID of the Cloud Bigtable cluster.
+
+* `zone` - (Optional) The zone to create the Cloud Bigtable cluster in. Zones that support Bigtable instances are noted on the [Cloud Bigtable locations page](https://cloud.google.com/bigtable/docs/locations).
+
+* `num_nodes` - (Optional) The number of nodes in your Cloud Bigtable cluster. Minimum of `3` for a `PRODUCTION` instance. Cannot be set for a `DEVELOPMENT` instance.
+
+* `storage_type` - (Optional) The storage type to use. One of `"SSD"` or `"HDD"`. Defaults to `"SSD"`.
+
 ## Attributes Reference
 
 Only the arguments listed above are exposed as attributes.