Implement build_indices_and_constraints for Kuzu and Neptune drivers

Both Kuzu and Neptune drivers were missing the build_indices_and_constraints
method required by the abstract GraphDriver base class. Kuzu uses a no-op
implementation since indices are created during schema setup. Neptune delegates
to its existing OpenSearch (AOSS) index creation logic.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

graphiti_core/driver/kuzu_driver.py

@@ -140,6 +140,12 @@ class KuzuDriver(GraphDriver):
     def delete_all_indexes(self, database_: str):
         pass
 
+    async def build_indices_and_constraints(self, delete_existing: bool = False):
+        # Kuzu doesn't support dynamic index creation like Neo4j or FalkorDB
+        # Schema and indices are created during setup_schema()
+        # This method is required by the abstract base class but is a no-op for Kuzu
+        pass
+
     def setup_schema(self):
         conn = kuzu.Connection(self.db)
         conn.execute(SCHEMA_QUERIES)

graphiti_core/driver/neptune_driver.py

@@ -243,6 +243,12 @@ class NeptuneDriver(GraphDriver):
             if client.indices.exists(index=index_name):
                 client.indices.delete(index=index_name)
 
+    async def build_indices_and_constraints(self, delete_existing: bool = False):
+        # Neptune uses OpenSearch (AOSS) for indexing
+        if delete_existing:
+            await self.delete_aoss_indices()
+        await self.create_aoss_indices()
+
     def run_aoss_query(self, name: str, query_text: str, limit: int = 10) -> dict[str, Any]:
         for index in aoss_indices:
             if name.lower() == index['index_name']: