Yes, if the preview is the representation of what you have indexed, then half of that article is missing. You may have identified the weakest link in your stack - crawler/extractor (which is notoriously hard to do, would be good if you provided more detail eg. do you use headless browser or simple GET request, do you crawl PDFs etc). Little use of the advanced stack on top of it, if the data does not end in the index in the first place. Hope you provide an update on this in the future. I'd probably sign up for a plan.