title: What's the difference between search-as-you-type and context suggester?
body: <p>I want to implement search-as-you-type (i.e. autosuggest in a search input) and it seems there are at least two doc pages with different approaches to do this: </p>
  
  <p><a href="https://www.elastic.co/guide/en/elasticsearch/guide/2.x/_index_time_search_as_you_type.html" rel="noreferrer">https://www.elastic.co/guide/en/elasticsearch/guide/2.x/_index_time_search_as_you_type.html</a></p>
  
  <p><a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/suggester-context.html" rel="noreferrer">https://www.elastic.co/guide/en/elasticsearch/reference/current/suggester-context.html</a></p>
  
  <p>Am I right that with suggester, I manually provide records for the suggestion index whereas in the search-as-you-type, I'm using the existing index data? Why would I choose one over the other?</p>