Fix version for include_global_state in Snapshot Status API

It also adds a Rest test.

Related #26853

core/src/main/java/org/elasticsearch/action/admin/cluster/snapshots/status/SnapshotStatus.java

@@ -147,7 +147,7 @@ public class SnapshotStatus implements ToXContentObject, Streamable {
             builder.add(SnapshotIndexShardStatus.readShardSnapshotStatus(in));
         }
         shards = Collections.unmodifiableList(builder);
-        if (in.getVersion().onOrAfter(Version.V_7_0_0_alpha1)) {
+        if (in.getVersion().onOrAfter(Version.V_6_2_0)) {
             includeGlobalState = in.readOptionalBoolean();
         }
         updateShardStats();
@@ -161,7 +161,7 @@ public class SnapshotStatus implements ToXContentObject, Streamable {
         for (SnapshotIndexShardStatus shard : shards) {
             shard.writeTo(out);
         }
-        if (out.getVersion().onOrAfter(Version.V_7_0_0_alpha1)) {
+        if (out.getVersion().onOrAfter(Version.V_6_2_0)) {
             out.writeOptionalBoolean(includeGlobalState);
         }
     }

core/src/main/java/org/elasticsearch/snapshots/SnapshotInfo.java

@@ -72,7 +72,7 @@ public final class SnapshotInfo implements Comparable<SnapshotInfo>, ToXContent,
     private static final String INCLUDE_GLOBAL_STATE = "include_global_state";
 
     private static final Version VERSION_INCOMPATIBLE_INTRODUCED = Version.V_5_2_0;
-    private static final Version INCLUDE_GLOBAL_STATE_INTRODUCED = Version.V_7_0_0_alpha1;
+    private static final Version INCLUDE_GLOBAL_STATE_INTRODUCED = Version.V_6_2_0;
     public static final Version VERBOSE_INTRODUCED = Version.V_5_5_0;
 
     private static final Comparator<SnapshotInfo> COMPARATOR =

rest-api-spec/src/main/resources/rest-api-spec/test/snapshot.get/10_basic.yml

@@ -49,7 +49,7 @@ setup:
         snapshot: test_nonexistent_snapshot
 
 ---
-"Get missing snapshot info succeeds when ignoreUnavailable is true":
+"Get missing snapshot info succeeds when ignore_unavailable is true":
 
   - do:
       snapshot.get:
@@ -96,3 +96,63 @@ setup:
       snapshot.delete:
         repository: test_repo_get_1
         snapshot: test_snapshot
+
+---
+"Get snapshot info contains include_global_state":
+  - skip:
+      version: " - 6.1.99"
+      reason: "include_global_state field has been added in the response in 6.2.0"
+
+  - do:
+      indices.create:
+        index: test_index
+        body:
+          settings:
+            number_of_shards:   1
+            number_of_replicas: 0
+
+  - do:
+      snapshot.create:
+        repository: test_repo_get_1
+        snapshot: test_snapshot_with_include_global_state
+        wait_for_completion: true
+        body: |
+          { "include_global_state": true }
+
+  - do:
+      snapshot.get:
+        repository: test_repo_get_1
+        snapshot: test_snapshot_with_include_global_state
+
+  - is_true: snapshots
+  - match: { snapshots.0.snapshot: test_snapshot_with_include_global_state }
+  - match: { snapshots.0.state: SUCCESS }
+  - match: { snapshots.0.include_global_state: true }
+
+  - do:
+      snapshot.delete:
+        repository: test_repo_get_1
+        snapshot: test_snapshot_with_include_global_state
+
+  - do:
+      snapshot.create:
+        repository: test_repo_get_1
+        snapshot: test_snapshot_without_include_global_state
+        wait_for_completion: true
+        body: |
+          { "include_global_state": false }
+
+  - do:
+      snapshot.get:
+        repository: test_repo_get_1
+        snapshot: test_snapshot_without_include_global_state
+
+  - is_true: snapshots
+  - match: { snapshots.0.snapshot: test_snapshot_without_include_global_state }
+  - match: { snapshots.0.state: SUCCESS }
+  - match: { snapshots.0.include_global_state: false }
+
+  - do:
+      snapshot.delete:
+        repository: test_repo_get_1
+        snapshot: test_snapshot_without_include_global_state