DocCrawler provides an interface to implement by search engine crawlers when crawling a specific document via
Add fandoc formatted text to the index for current doc
Add a search keyword with a curated title, summary formatted as fandoc, and an optional fragment anchor within the document. This is used to index API keywords like types, slot name, qnames, etc. The summary is used only for hit higlighting and should be added to the index itself separately.
Add plain, unformatted text to the index for current doc