fix: Do not eat bitmap backfill errors (#871)

If the stream yielding block heights from the bitmap indexer fails, its
error will be eaten by the while loop as the loop will simply end if any
error takes place. This PR ensures that if the result from the stream is
an error, it logs the error before proceeding with Lake.

block-streamer/src/block_stream.rs

@@ -269,15 +269,26 @@ async fn process_bitmap_indexer_blocks(
 
     let mut last_published_block_height: u64 = start_block_height;
 
-    while let Some(Ok(block_height)) = matching_block_heights.next().await {
-        redis
-            .publish_block(indexer, redis_stream.clone(), block_height, MAX_STREAM_SIZE)
-            .await?;
-        redis
-            .set_last_processed_block(indexer, block_height)
-            .await?;
-
-        last_published_block_height = block_height;
+    while let Some(block_height_result) = matching_block_heights.next().await {
+        match block_height_result {
+            Ok(block_height) => {
+                redis
+                    .publish_block(indexer, redis_stream.clone(), block_height, MAX_STREAM_SIZE)
+                    .await?;
+                redis
+                    .set_last_processed_block(indexer, block_height)
+                    .await?;
+
+                last_published_block_height = block_height;
+            }
+            Err(err) => {
+                tracing::error!(
+                    "Backfill using bitmap indexer failed unexpectedly: {:?}",
+                    err
+                );
+                break;
+            }
+        }
     }
 
     Ok(last_published_block_height)