community: add collection_properties parameter to Milvus (#15788)

- **Description:** add collection_properties parameter to Milvus. See
[pymilvus set_properties()
description](https://milvus.io/api-reference/pymilvus/v2.3.x/Collection/set_properties().md)
  - **Issue:** None
  - **Dependencies:** None
  - **Twitter handle:** None

libs/community/langchain_community/retrievers/milvus.py

@@ -18,6 +18,7 @@ class MilvusRetriever(BaseRetriever):
 
     embedding_function: Embeddings
     collection_name: str = "LangChainCollection"
+    collection_properties: Optional[Dict[str, Any]] = None
     connection_args: Optional[Dict[str, Any]] = None
     consistency_level: str = "Session"
     search_params: Optional[dict] = None
@@ -31,6 +32,7 @@ class MilvusRetriever(BaseRetriever):
         values["store"] = Milvus(
             values["embedding_function"],
             values["collection_name"],
+            values["collection_properties"],
             values["connection_args"],
             values["consistency_level"],
         )