Autocomplete Impressions

// After your autocomplete API returns:
const sourceType       = 'popular_search';
const searchTerm       = 'running shoes';
const suggestionCount  = suggestions.length;      // e.g. 3
const suggestions      = suggestions.items;      // e.g. ['shirts','jeans','shoes']


ExpAnalyticsService.trackAcImpression({
  ac_source: sourceType,
  search_term: searchTerm,
  no_of_results: suggestionCount,
  items: suggestions
});