Autocomplete
Modern searching doesn't go without the autocomplete functionality. Thanks to it, users are provided with a convenient way to find items whose spelling isn't known. Autocomplete can also be a good marketing tool. For these reasons, sooner or later, you'll want to know how to implement this feature.
Before we configure autocomplete, we should ask ourselves a few questions: what data do we want to use for suggestions? Do we have a set of suggestions already prepared (such as country names) or do we want to generate them dynamically, based on indexed documents? Do we want to suggest words or whole documents? Do we need information about the number of suggested items? And finally, do we want to display only one field from the document or a few (for example, product name and price)? Each possible solution has its pros and cons and supports one requirement at the cost of another. Now, let's go through three common ways to implement the autocomplete functionality in ElasticSearch.
