Addressing comments

Signed-off-by: Shubh Sahu <[email protected]>

Author: Shubh Sahu

server/src/main/java/org/opensearch/index/shard/IndexShard.java

@@ -1629,7 +1629,6 @@ public org.apache.lucene.util.Version minimumCompatibleVersion() {
      * @return Tuple(Tuple(primaryTerm, commitGeneration), indexFilesToFileLengthMap)
      * @throws IOException
      */
-
     public Tuple<Tuple<Long, Long>, Map<String, Long>> acquireLastRemoteUploadedIndexCommit() throws IOException {
         if (!indexSettings.isAssignedOnRemoteNode()) {
             throw new IllegalStateException("Index is not assigned on Remote Node");

server/src/main/java/org/opensearch/repositories/FilterRepository.java

@@ -237,9 +237,7 @@ public void snapshotRemoteStoreIndexShard(
         String shardStateIdentifier,
         IndexShardSnapshotStatus snapshotStatus,
         long primaryTerm,
-        long commitGeneration,
         long startTime,
-        Map<String, Long> indexFilesToFileLengthMap,
         ActionListener<String> listener
     ) {
         in.snapshotRemoteStoreIndexShard(
@@ -250,9 +248,7 @@ public void snapshotRemoteStoreIndexShard(
             shardStateIdentifier,
             snapshotStatus,
             primaryTerm,
-            commitGeneration,
             startTime,
-            indexFilesToFileLengthMap,
             listener
         );
     }

server/src/main/java/org/opensearch/repositories/Repository.java

@@ -402,6 +402,43 @@ void snapshotShard(
      * @param startTime                start time of the snapshot commit, this will be used as the start time for snapshot.
      * @param listener                 listener invoked on completion
      */
+    default void snapshotRemoteStoreIndexShard(
+        Store store,
+        SnapshotId snapshotId,
+        IndexId indexId,
+        IndexCommit snapshotIndexCommit,
+        @Nullable String shardStateIdentifier,
+        IndexShardSnapshotStatus snapshotStatus,
+        long primaryTerm,
+        long startTime,
+        ActionListener<String> listener
+    ) {
+        throw new UnsupportedOperationException();
+    }
+
+    /**
+     * Adds a reference of remote store data for a index commit point.
+     * <p>
+     * The index commit point can be obtained by using {@link org.opensearch.index.engine.Engine#acquireLastIndexCommit} method.
+     * Or for closed index can be obtained by reading last remote uploaded metadata by using {@link org.opensearch.index.shard.IndexShard#acquireLastRemoteUploadedIndexCommit} method.
+     * Repository implementations shouldn't release the snapshot index commit point. It is done by the method caller.
+     * <p>
+     * As snapshot process progresses, implementation of this method should update {@link IndexShardSnapshotStatus} object and check
+     * {@link IndexShardSnapshotStatus#isAborted()} to see if the snapshot process should be aborted.
+     * @param store                    store to be snapshotted
+     * @param snapshotId               snapshot id
+     * @param indexId                  id for the index being snapshotted
+     * @param snapshotIndexCommit      commit point
+     * @param shardStateIdentifier     a unique identifier of the state of the shard that is stored with the shard's snapshot and used
+     *                                 to detect if the shard has changed between snapshots. If {@code null} is passed as the identifier
+     *                                 snapshotting will be done by inspecting the physical files referenced by {@code snapshotIndexCommit}
+     * @param snapshotStatus           snapshot status
+     * @param primaryTerm              current Primary Term
+     * @param commitGeneration         current commit generation
+     * @param startTime                start time of the snapshot commit, this will be used as the start time for snapshot.
+     * @param indexFilesToFileLengthMap map of index files to file length
+     * @param listener                 listener invoked on completion
+     */
     default void snapshotRemoteStoreIndexShard(
         Store store,
         SnapshotId snapshotId,