Revert "remove unused batch function"

This reverts commit 6f68d471fa.

mcp_codebase.py

@@ -1401,6 +1401,23 @@ def build_indexes():
     elapsed = index_build_time - start_time
     logger.info(f"Index build complete with contextual weighting applied. Total time: {elapsed:.1f}s")
 
+# -----------------------------
+# Build / load indexes with contextual weighting and batch embedding
+# -----------------------------
+def batch_embed_documents(texts: List[str]) -> List[List[float]]:
+    """Embed documents in batches for better performance."""
+    all_embeddings = []
+    total_batches = (len(texts) + EMBEDDING_BATCH_SIZE - 1) // EMBEDDING_BATCH_SIZE
+
+    for i in range(0, len(texts), EMBEDDING_BATCH_SIZE):
+        batch = texts[i:i + EMBEDDING_BATCH_SIZE]
+        batch_num = i // EMBEDDING_BATCH_SIZE + 1
+        logger.info(f"Embedding batch {batch_num}/{total_batches} ({len(batch)} docs)...")
+        batch_embeddings = embeddings.embed_documents(batch)
+        all_embeddings.extend(batch_embeddings)
+
+    return all_embeddings
+
 def load_indexes():
     global vectorstore, bm25, bm25_corpus, chunks_metadata, embeddings, index_build_time
     logger.info("Loading indexes from disk...")