Merge branch 'stable-3.2'

* stable-3.2:
  Update git submodules
  Fix documentation of `container.slave`
  Fix documentation of `container.slave`
  Update git submodules
  Update git submodules
  Submit: Use updated change for response
  Remove Content-Type header from 'Submit Revision' example
  Update git submodules
  Add support for Elasticsearch version 7.8.*
  Fix `parent` in `gr-change-metadata` when there is no revision

Change-Id: Ifaaad90a7343da4e301137616bc7c82e92bd6f3c

java/com/google/gerrit/elasticsearch/ElasticVersion.java

@@ -28,7 +28,8 @@ public enum ElasticVersion {
   V7_4("7.4.*"),
   V7_5("7.5.*"),
   V7_6("7.6.*"),
-  V7_7("7.7.*");
+  V7_7("7.7.*"),
+  V7_8("7.8.*");
 
   private final String version;
   private final Pattern pattern;

java/com/google/gerrit/server/restapi/change/Submit.java

@@ -214,7 +214,7 @@ public class Submit
 
       updatedChange = op.merge(change, submitter, true, input, false);
       if (updatedChange.isMerged()) {
-        return Response.ok(new Output(change));
+        return Response.ok(new Output(updatedChange));
       }
 
       throw new IllegalStateException(