Change RCSS info logs to debug (opensearch-project#14814) (opensearch-project#14822)

(cherry picked from commit 1299919)

Signed-off-by: Shivansh Arora <[email protected]>
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Signed-off-by: kkewwei <[email protected]>

Author: 2 people

server/src/main/java/org/opensearch/gateway/remote/RemoteClusterStateService.java

@@ -259,7 +259,7 @@ public RemoteClusterStateManifestInfo writeFullMetadata(ClusterState clusterStat
                 uploadedMetadataResults.uploadedIndicesRoutingMetadata.size()
             );
         } else {
-            logger.info(
+            logger.debug(
                 "writing cluster state took [{}ms]; " + "wrote full state with [{}] indices, [{}] indicesRouting and global metadata",
                 durationMillis,
                 uploadedMetadataResults.uploadedIndexMetadata.size(),
@@ -458,8 +458,8 @@ public RemoteClusterStateManifestInfo writeIncrementalMetadata(
                 customsDiff.getUpserts().size()
             );
         } else {
-            logger.info("{}; {}", clusterStateUploadTimeMessage, metadataUpdateMessage);
-            logger.info(
+            logger.debug("{}; {}", clusterStateUploadTimeMessage, metadataUpdateMessage);
+            logger.debug(
                 "writing cluster state for version [{}] took [{}ms]; "
                     + "wrote metadata for [{}] indices and skipped [{}] unchanged indices, coordination metadata updated : [{}], "
                     + "settings metadata updated : [{}], templates metadata updated : [{}], custom metadata updated : [{}]",