Vertex AI Search or Document AI

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Hi,

I want to query DOCX/JPG documents to check if they contain specific sections of text.   We want to use out-of-the-box RAG and hence thinking of using Vertex AI Search and PaLM2.    Do we then still require Document AI to extract text and feed to Vertex AI Search or that's already taken care of by Vertex AI Search?    Also, in this use case, PaLM2 is better or Gemini models?

Thank you.