Include size of snapshot in snapshot metadata

docs/reference/migration/migrate_7_0.asciidoc

@@ -34,7 +34,7 @@ Elasticsearch 6.x in order to be readable by Elasticsearch 7.x.
 * <<breaking_70_api_changes>>
 * <<breaking_70_java_changes>>
 * <<breaking_70_settings_changes>>
-
+* <<breaking_70_snapshotstats_changes>>
 
 include::migrate_7_0/aggregations.asciidoc[]
 include::migrate_7_0/analysis.asciidoc[]
@@ -47,3 +47,4 @@ include::migrate_7_0/plugins.asciidoc[]
 include::migrate_7_0/api.asciidoc[]
 include::migrate_7_0/java.asciidoc[]
 include::migrate_7_0/settings.asciidoc[]
+include::migrate_7_0/snapshotstats.asciidoc[]

docs/reference/migration/migrate_7_0/snapshotstats.asciidoc

@@ -0,0 +1,13 @@
+[[breaking_70_snapshotstats_changes]]
+=== Snapshot stats changes
+
+Snapshot stats details are provided in a new structured way:
+
+* `total` section for all the files that are referenced by the snapshot
+* `incremental` section for those files that actually needed to be copied over as part of the incremental snapshotting.
+* In case of a snapshot that's still in progress, there's also a`processed` section for files that are in the process of being copied.
+
+==== Deprecated `number_of_files`, `processed_files`, `total_size_in_bytes` and `processed_size_in_bytes` snapshot stats properties have been removed
+
+* Properties `number_of_files` and `total_size_in_bytes` are removed and should be replaced by values of nested object `total`.
+* Properties `processed_files` and `processed_size_in_bytes` are removed and should be replaced by values of nested object `processed`.

docs/reference/modules/snapshots.asciidoc

@@ -614,7 +614,7 @@ The output is composed of different sections. The `stats` sub-object provides de
 snapshotted. As snapshots are incremental, copying only the Lucene segments that are not already in the repository,
 the `stats` object contains a `total` section for all the files that are referenced by the snapshot, as well as an `incremental` section
 for those files that actually needed to be copied over as part of the incremental snapshotting. In case of a snapshot that's still
-n progress, there's also a `processed` section that contains information about the files that are in the process of being copied.
+in progress, there's also a `processed` section that contains information about the files that are in the process of being copied.
 
 _Note_: Properties `number_of_files`, `processed_files`, `total_size_in_bytes` and `processed_size_in_bytes` are used for
 backward compatibility reasons with older 5.x and 6.x versions. These fields will be removed in Elasticsearch v7.0.0.