Your configuration looks correct. However, you've given no room for error margins, specifically with the frozenTimePeriodInSecs.
If you are using NTP within your environment, the protocol might experience errors, resulting in unexpecting behavior such as the deletion of your index data.
I'll advice you to increase the frozenTimePeriodInSecs above 6 months and allow the maxTotalDataSizeMB rule to enforce your retention policy.
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My thoughts are that you should read the app/add-on description. The developer must have mentioned how and were to install the app/add-on.
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