indexed items and sync store

Am I right that externally indexed items still get uploaded to the sync store? Assuming I am correct, is there any way to not do this?

I am syncing to and couldn’t figure out why my sync databases were filling my storage. I think the indexed items are my answer

You can uncheck the item Synchronize content of indexed items in the Info for the Sync location.
Screen Shot 2017-02-24 at 3.41.25 PM.png

thanks! Will unchecking that “purge” the sync store of the items?

No. You have to Clean the database or Location.