fix(tavily): remove self._search_params, use self.search_params directly

Author: SyedShahmeerAli12

integrations/tavily/README.md

@@ -11,8 +11,4 @@
 
 Refer to the general [Contribution Guidelines](https://github.com/deepset-ai/haystack-core-integrations/blob/main/CONTRIBUTING.md).
 
-To run integration tests, export your Tavily API key:
-
-```bash
-export TAVILY_API_KEY=<your-api-key>
-```
+To run integration tests locally, you need to export the `TAVILY_API_KEY` environment variable.

integrations/tavily/src/haystack_integrations/components/websearch/tavily/tavily_websearch.py

@@ -61,7 +61,6 @@ def __init__(
         self.api_key = api_key
         self.top_k = top_k
         self.search_params = search_params
-        self._search_params = search_params or {}
         self._tavily_client: TavilyClient | None = None
         self._async_tavily_client: AsyncTavilyClient | None = None
 
@@ -99,7 +98,7 @@ def run(
             msg = "TavilyWebSearch client failed to initialize."
             raise RuntimeError(msg)
 
-        params = (search_params if search_params is not None else self._search_params).copy()
+        params = (search_params if search_params is not None else self.search_params or {}).copy()
         if "max_results" not in params and self.top_k is not None:
             params["max_results"] = self.top_k
 
@@ -129,7 +128,7 @@ async def run_async(
             msg = "TavilyWebSearch async client failed to initialize."
             raise RuntimeError(msg)
 
-        params = (search_params if search_params is not None else self._search_params).copy()
+        params = (search_params if search_params is not None else self.search_params or {}).copy()
         if "max_results" not in params and self.top_k is not None:
             params["max_results"] = self.top_k