1. As @VatsalJagani already pointed out - mongodb is an integral part of Splunk distribution and Splunk relies on it to work properly. Therefore changing its configuration is not recommended and you're very likely to cause problems if you're changing things without deep understanding of their impact for the whole environment. 2. Baseline checks, vulnerability scans and such are just tools to help you assess the state of the system, not do the job for you. They alone are not sufficient grounds for telling you what is OK and what is not. Running them blindly and following their "recommendations" without understanding the results of performed tests and their context is not a good practice.
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