Fix import name from indexDefinition to index_definition

Author: up1

src/tools/redis_query_engine.py

@@ -3,7 +3,7 @@
 from common.server import mcp
 from redis.commands.search.query import Query
 from redis.commands.search.field import VectorField
-from redis.commands.search.indexDefinition import IndexDefinition
+from redis.commands.search.index_definition import IndexDefinition
 import numpy as np