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Hello,
Upon examining the code, I cannot see any provisions for sending a signed request. As you are encountering a 403 error, which typically indicates an authentication issue, rather than the library being incapable of sending a signed request, I would kindly request that you verify your ability to send a signed request using Langchain4j.
Signed Request to OpenSearch Serverless: https://docs.aws.amazon.com/opensearch-service/latest/developerguide/serverless-clients.html
Additionally, I have observed that there is already an open feature request to support OpenSearch Serverless: https://github.com/langchain4j/langchain4j/issues/1324
Furthermore, I have found an online documentation resource that demonstrates how to establish a connection with Python: https://caylent.com/blog/building-a-rag-with-open-search-serverless-and-lang-chain
Thank you!
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