Not sure if I am answering question directly, but here is what I know. When you search on a keyword the search engine will display content that includes the keyword in the tag or content. For people the keyword must be included in their profile. In my example below I searched on the keywords "business case". I had created a document with those words in the title. You will see that I am not listed in search results because those keywords are not included in my profile. My name does appear as the creator by the document listed in the search results.