[RSS Feed/News] Trying to understand indexing vs rebuilding cache

[XenForo]

I have an addon that adds some new search constraints. The data gets properly indexed, and after rebuilding cache in ACP I can search using those constraints and it works. However, when a new item is posted, it will not appear in the search using those constraints until I rebuild cache again in the ACP.

Is there a hook or other process I am missing in my code that would properly index the data so that it would be searchable immediately without needing to manually rebuild the cache?
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