Using Generative AI (Copilot, Gemini, or ChatGPT) to get indexing terms for reports

[GrumpyMonk099]

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Part of my job is to find indexing terms for reports to tag in a data base management software. The challenging thing is that I need to pick relevant terms for the report from a list of around 21000 terms. I was thinking about ways to accomplish this using Copilot. I tried by uploading the report in pdf format and list of terms in excel sheet and asking the copilot to find relevant terms. However, it fails to do so, probably because of the how big the list is. When I pick a single world and ask if it is relevant for the report, it was able to provide answer to the same. Can anyone suggest a workaround for this, or at lease let me know if it is possible or not. Thank you in advance.