Query Suggestions, or Autocomplete, are only suggestions of better queries. For instance, if a user starts entering the snippet “smartphone,” they would be invited to choose a more precise query such as smartphone apple or smartphone iphone xs. With a more finely tuned query like that, their odds of retrieving the right search autocomplete results would increase.

Yes, you can combine different suggestions types, such as for products, categories, brands, articles, and blog posts, on a single autocomplete menu. You can even display multiple sections of results generated by searching different indexes or searching for facet possible values. 

The Query Suggestions builder normalizes and completes suggestions to remove suggestions that are duplicated, similar, or have a prefix.

You can also customize a set of configurable constraints that disqualifies search terms from your suggestion index. If a suggestion matches any of these criteria, it’s not included as a search term:

• It contains non-alphanumeric characters
• It doesn’t meet the minimum number of results (five by default) configured when querying a given source index
• It’s not long enough (four letters by default)
• It matches any banned expressions (suggestions the builder will never include, regardless of popularity)

Top searches from the Analytics API are aggregated, but the builder goes further. Here’s a good example: if tablets, Tabl, Tablets and tablet are top searches in your source index, the builder would narrow the specification to the term with the most searches.

It’s also a good idea to correctly designate the language, as well as remove irrelevant and inappropriate searches by configuring the banned expressions.

The builder rebuilds the index once every 24 hours, or whenever you change and save its configuration. Query Suggestions takes into account data items in the last 30 days, and the index is based on a sliding window of the most recent analytics data. When calculating suggestion popularity, searches made earlier in the 30-day period don’t count less than those made more recently.