[Snapshot Interop] Keep API parameters behind remote store experiment…

…al flag. (opensearch-project#8594)

Signed-off-by: Harish Bhakuni <hbhakuni@amazon.com>

server/src/main/java/org/opensearch/action/admin/cluster/snapshots/restore/RestoreSnapshotRequest.java

@@ -41,6 +41,7 @@
 import org.opensearch.common.io.stream.StreamOutput;
 import org.opensearch.common.logging.DeprecationLogger;
 import org.opensearch.common.settings.Settings;
+import org.opensearch.common.util.FeatureFlags;
 import org.opensearch.core.common.Strings;
 import org.opensearch.core.xcontent.ToXContentObject;
 import org.opensearch.core.xcontent.XContentBuilder;
@@ -150,7 +151,7 @@ public RestoreSnapshotRequest(StreamInput in) throws IOException {
         if (in.getVersion().onOrAfter(Version.V_2_7_0)) {
             storageType = in.readEnum(StorageType.class);
         }
-        if (in.getVersion().onOrAfter(Version.V_2_9_0)) {
+        if (FeatureFlags.isEnabled(FeatureFlags.REMOTE_STORE) && in.getVersion().onOrAfter(Version.V_2_9_0)) {
             sourceRemoteStoreRepository = in.readOptionalString();
         }
     }
@@ -174,7 +175,7 @@ public void writeTo(StreamOutput out) throws IOException {
         if (out.getVersion().onOrAfter(Version.V_2_7_0)) {
             out.writeEnum(storageType);
         }
-        if (out.getVersion().onOrAfter(Version.V_2_9_0)) {
+        if (FeatureFlags.isEnabled(FeatureFlags.REMOTE_STORE) && out.getVersion().onOrAfter(Version.V_2_9_0)) {
             out.writeOptionalString(sourceRemoteStoreRepository);
         }
     }
@@ -614,6 +615,11 @@ public RestoreSnapshotRequest source(Map<String, Object> source) {
                 }
 
             } else if (name.equals("source_remote_store_repository")) {
+                if (!FeatureFlags.isEnabled(FeatureFlags.REMOTE_STORE)) {
+                    throw new IllegalArgumentException(
+                        "Unsupported parameter " + name + ". Please enable remote store feature flag for this experimental feature"
+                    );
+                }
                 if (entry.getValue() instanceof String) {
                     setSourceRemoteStoreRepository((String) entry.getValue());
                 } else {
@@ -664,7 +670,7 @@ public XContentBuilder toXContent(XContentBuilder builder, Params params) throws
         if (storageType != null) {
             storageType.toXContent(builder);
         }
-        if (sourceRemoteStoreRepository != null) {
+        if (FeatureFlags.isEnabled(FeatureFlags.REMOTE_STORE) && sourceRemoteStoreRepository != null) {
             builder.field("source_remote_store_repository", sourceRemoteStoreRepository);
         }
         builder.endObject();
@@ -681,7 +687,7 @@ public boolean equals(Object o) {
         if (this == o) return true;
         if (o == null || getClass() != o.getClass()) return false;
         RestoreSnapshotRequest that = (RestoreSnapshotRequest) o;
-        return waitForCompletion == that.waitForCompletion
+        boolean equals = waitForCompletion == that.waitForCompletion
             && includeGlobalState == that.includeGlobalState
             && partial == that.partial
             && includeAliases == that.includeAliases
@@ -694,27 +700,48 @@ public boolean equals(Object o) {
             && Objects.equals(indexSettings, that.indexSettings)
             && Arrays.equals(ignoreIndexSettings, that.ignoreIndexSettings)
             && Objects.equals(snapshotUuid, that.snapshotUuid)
-            && Objects.equals(storageType, that.storageType)
-            && Objects.equals(sourceRemoteStoreRepository, that.sourceRemoteStoreRepository);
+            && Objects.equals(storageType, that.storageType);
+        if (FeatureFlags.isEnabled(FeatureFlags.REMOTE_STORE)) {
+            equals = Objects.equals(sourceRemoteStoreRepository, that.sourceRemoteStoreRepository);
+        }
+        return equals;
     }
 
     @Override
     public int hashCode() {
-        int result = Objects.hash(
-            snapshot,
-            repository,
-            indicesOptions,
-            renamePattern,
-            renameReplacement,
-            waitForCompletion,
-            includeGlobalState,
-            partial,
-            includeAliases,
-            indexSettings,
-            snapshotUuid,
-            storageType,
-            sourceRemoteStoreRepository
-        );
+        int result;
+        if (FeatureFlags.isEnabled(FeatureFlags.REMOTE_STORE)) {
+            result = Objects.hash(
+                snapshot,
+                repository,
+                indicesOptions,
+                renamePattern,
+                renameReplacement,
+                waitForCompletion,
+                includeGlobalState,
+                partial,
+                includeAliases,
+                indexSettings,
+                snapshotUuid,
+                storageType,
+                sourceRemoteStoreRepository
+            );
+        } else {
+            result = Objects.hash(
+                snapshot,
+                repository,
+                indicesOptions,
+                renamePattern,
+                renameReplacement,
+                waitForCompletion,
+                includeGlobalState,
+                partial,
+                includeAliases,
+                indexSettings,
+                snapshotUuid,
+                storageType
+            );
+        }
         result = 31 * result + Arrays.hashCode(indices);
         result = 31 * result + Arrays.hashCode(ignoreIndexSettings);
         return result;

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

@@ -63,6 +63,7 @@
 import org.opensearch.common.settings.Setting;
 import org.opensearch.common.settings.Settings;
 import org.opensearch.common.unit.TimeValue;
+import org.opensearch.common.util.FeatureFlags;
 import org.opensearch.common.util.concurrent.ConcurrentCollections;
 import org.opensearch.common.util.io.IOUtils;
 import org.opensearch.repositories.blobstore.MeteredBlobStoreRepository;
@@ -627,6 +628,12 @@ public static void validateRepositoryMetadataSettings(
                     + minVersionInCluster
             );
         }
+        if (REMOTE_STORE_INDEX_SHALLOW_COPY.get(repositoryMetadataSettings) && !FeatureFlags.isEnabled(FeatureFlags.REMOTE_STORE)) {
+            throw new RepositoryException(
+                repositoryName,
+                "setting " + REMOTE_STORE_INDEX_SHALLOW_COPY.getKey() + " cannot be enabled, as remote store feature is not enabled."
+            );
+        }
     }
 
     private static void ensureRepositoryNotInUse(ClusterState clusterState, String repository) {

server/src/main/java/org/opensearch/snapshots/RestoreService.java

@@ -453,6 +453,12 @@ public ClusterState execute(ClusterState currentState) {
                                 final boolean isRemoteStoreShallowCopy = Boolean.TRUE.equals(
                                     snapshotInfo.isRemoteStoreIndexShallowCopyEnabled()
                                 ) && metadata.index(index).getSettings().getAsBoolean(SETTING_REMOTE_STORE_ENABLED, false);
+                                if (isSearchableSnapshot && isRemoteStoreShallowCopy) {
+                                    throw new SnapshotRestoreException(
+                                        snapshot,
+                                        "Shallow copy snapshot cannot be restored as searchable snapshot."
+                                    );
+                                }
                                 if (isRemoteStoreShallowCopy && !currentState.getNodes().getMinNodeVersion().onOrAfter(Version.V_2_9_0)) {
                                     throw new SnapshotRestoreException(
                                         snapshot,