Avoid NPE if on SnapshotInfo if 'shallow' boolean not present (#18218) (#18223)

(cherry picked from commit c32262d)

Signed-off-by: Andrew Ross <[email protected]>

Author: andrross

CHANGELOG.md

@@ -15,6 +15,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ### Fixed
 - Use Bad Request status for InputCoercionException ([#18161](https://github.com/opensearch-project/OpenSearch/pull/18161))
+- Avoid NPE if on SnapshotInfo if 'shallow' boolean not present ([#18187](https://github.com/opensearch-project/OpenSearch/issues/18187))
 - Null check field names in QueryStringQueryBuilder ([#18194](https://github.com/opensearch-project/OpenSearch/pull/18194))
 
 ### Security

server/src/main/java/org/opensearch/repositories/blobstore/BlobStoreRepository.java

@@ -4711,7 +4711,7 @@ public IndexShardSnapshot loadShardSnapshot(BlobContainer shardContainer, Snapsh
             SnapshotId snapshotId = snapshotInfo.snapshotId();
             if (snapshotInfo.getPinnedTimestamp() != 0) {
                 return () -> IndexShardSnapshotStatus.newDone(0L, 0L, 0, 0, 0, 0, "1");
-            } else if (snapshotInfo.isRemoteStoreIndexShallowCopyEnabled()) {
+            } else if (Boolean.TRUE.equals(snapshotInfo.isRemoteStoreIndexShallowCopyEnabled())) {
                 if (shardContainer.blobExists(REMOTE_STORE_SHARD_SHALLOW_COPY_SNAPSHOT_FORMAT.blobName(snapshotId.getUUID()))) {
                     return REMOTE_STORE_SHARD_SHALLOW_COPY_SNAPSHOT_FORMAT.read(
                         shardContainer,