Getting only selected fields from AzureAISearchRetriever

[KishoreKunalPraval]

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Example Code

search_payload = {
                "search": search_query.strip('"'),  # Remove any quotes that might be added
                "count": True,
                "select": ", ".join(select_fields),
                "queryType": "semantic",
                "captions": "extractive",
                "answers": "extractive|count-3",
                "top": top_value,  # This should be 200 for list-all queries
                "skip": 0  # Explicitly set skip to 0
            }
            

What i want is to pass it like

    retriever = AzureAISearchRetriever(
        content_key="chunk",
        top_k=50,
        index_name=index,
        service_name="search"
        api_key=os.getenv("API_KEY", "your_api_key"),
        select_fields=select_fields_str  # Only retrieve these fields
    )
    retrievers.append(retriever)

### Description

I am trying to reduce the context i send to langchain , i have 12 indexes in ai search.

best way is to determine which fields are necessary to answer question then pass those fields as context using AzureAISearchRetriever

In Ai Search we can pass in enhanced search payload



### System Info

langchain==0.3.21
langchain-community==0.3.20
langchain-core==0.3.49
langchain-openai==0.3.11
langchain-text-splitters==0.3.7
langsmith==0.3.19

python- 3.11.9

windows