Some of the most crucial decisions in identifying research gaps involve search strategy decisions taken in doing a systematic review of the literature(SLR). Such decisions influence methodological design and the scope of the study. Methods inclusive of search strings or types of databases are used to conduct a systematic literature review. Most importantly, the exact specification or nature of search engines and database quality significantly impact the future course of research studies.
Don't have a "protocol", but guidelines and checklists. I recommend looking at the Cochrane Handbook (https://training.cochrane.org/handbook), Campbell Guidelines (https://onlinelibrary.wiley.com/pb-assets/assets/18911803/Campbell%20Policies%20and%20Guidelines%20v4-1559660867160.pdf) and JBI Manual (https://jbi-global-wiki.refined.site/space/MANUAL), in the respective chapters on how to conduct searches. The PRISMA-S Checklist (http://www.prisma-statement.org/Extensions/Searching) is specific to evaluate the search strategy.
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