Gary Illyes from Google posted recently on Twitter that said that generally GoogleBot "doesn't make use of cookies, but it can if it detects it cannot get to the content without them." So if your content requires cookies, GoogleBot may not be able to read the content but it likely will know that...
Following Criteria, I use when looking at so many domains
1. Make it brandable
2. Make it pronounceable
3. Make it short
4. Use broad keywords
5. Make it intuitive
Indexing generally refers to getting your web pages (or other various forms of content from PDFs to videos) indexed in Google & other search engines. A search engine will crawl your website in search of content to add to its index.