Example of MultiQuery Retriever using Azure Cognitive Search

[mdubeyAnsys]

Is there any example available on using MultiQuery Retriever for retrieving data from vector store of Azure Cognitive Search? I followed example of MultiQuery retriver and used AzureSearch vector store of langchain (from langchain_community.vectorstores.azuresearch import AzureSearch). It seems it generates multiple question for a user query "What is Llama-2" but failed with error, langchain_core.exceptions.OutputParserException: Invalid json output: Can you provide information on Llama-2?
Could you explain the concept of Llama-2?
What does Llama-2 refer to?