[Terraform] Add tags set conversion to upgrade guide (#1044)

Merged PR #1044.
GoogleCloudPlatform · Dec 12, 2018 · ed751b4 · ed751b4
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diff --git a/build/terraform b/build/terraform
diff --git a/build/terraform-beta b/build/terraform-beta
diff --git a/third_party/terraform/website/docs/version_2_upgrade.html.markdown b/third_party/terraform/website/docs/version_2_upgrade.html.markdown
@@ -468,6 +468,12 @@ Autogenerated buckets are shared by all clusters in the same region, so deleting
 this bucket could adversely harm other dataproc clusters. If you need a bucket
 that can be deleted, please create a new one and set the `staging_bucket` field.
 
+### `cluster_config.0.gce_cluster_config.0.tags` is now a Set
+
+The order of entries in `tags` no longer matters. Any configurations that
+interpolate based on an item at a specific index will need to be updated, as items
+may have been reordered.
+
 ## Resource: `google_filestore_instance`
 
 ### filestore resources have been removed from the GA provider