Unfortunetly I don't think there is and that can get very annoying when you play a faction (such as CSM) that has hundreds of different codeces, supplements and datasheets.
What does come close to an index is 1d4chan. Alot of people don't like this site because, well, it's a spawn of /tg/ but if you go to their tactics pages for an army then it has detailed accounts of what you will find in each codex, supplement, datasheet, etc. and it also gives a little overview of how to use the different units/equipment. Again, it's 1d4chan so take their advice with a pinch of salt (also their pages aren't always SFW).
Hope this helps.
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