[Engine] make Engine.Result#setTransLogLocation() setTook() freeze() … (#19275)

Make Engine.Result#setTransLogLocation(), setTook(), and freeze() public
so that they can be called from plugins that implement a custom Engine.

---------

Signed-off-by: jinnyw <[email protected]>
Co-authored-by: jinnyw <[email protected]>

Author: Jinny-Wang

CHANGELOG.md

@@ -28,6 +28,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Add CompletionStage variants to IndicesAdminClient as an alternative to ActionListener ([#19161](https://github.com/opensearch-project/OpenSearch/pull/19161))
 - Remove cap on Java version used by forbidden APIs ([#19163](https://github.com/opensearch-project/OpenSearch/pull/19163))
 - Disable pruning for `doc_values` for the wildcard field mapper ([#18568](https://github.com/opensearch-project/OpenSearch/pull/18568))
+- Make all methods in Engine.Result public ([#19276](https://github.com/opensearch-project/OpenSearch/pull/19275))
 
 ### Fixed
 - Fix unnecessary refreshes on update preparation failures ([#15261](https://github.com/opensearch-project/OpenSearch/issues/15261))

server/src/main/java/org/opensearch/index/engine/Engine.java

@@ -561,23 +561,23 @@ public Operation.TYPE getOperationType() {
             return operationType;
         }
 
-        void setTranslogLocation(Translog.Location translogLocation) {
+        public void setTranslogLocation(Translog.Location translogLocation) {
             if (freeze.get() == null) {
                 this.translogLocation = translogLocation;
             } else {
                 throw new IllegalStateException("result is already frozen");
             }
         }
 
-        void setTook(long took) {
+        public void setTook(long took) {
             if (freeze.get() == null) {
                 this.took = took;
             } else {
                 throw new IllegalStateException("result is already frozen");
             }
         }
 
-        void freeze() {
+        public void freeze() {
             freeze.set(true);
         }