ElasticSearch Nest AutoComplete based on words split by whitespace

Question

I have AutoComplete working with ElasticSearch (Nest) and it's fine when the user types in the letters from the begining of the phrase but I would like to be able to use a specialized type of auto complete if it's possible that caters for words in a sentence.

To clarify further, my requirement is to be able to "auto complete" like such:

Imagine the full indexed string is "this is some title". When the user types in "th", this comes back as a suggestion with my current code.

I would also like the same thing to be returned if the user types in "som" or "title" or any letters that form a word (word being classified as a string between two spaces or the start/end of the string).

The code I have is:

var result = _client.Search<ContentIndexable>(
            body => body
                        .Index(indexName)
                        .SuggestCompletion("content-suggest" + Guid.NewGuid(),
                                           descriptor =>
                                           descriptor
                                               .OnField(t => t.Title.Suffix("completion"))
                                               .Text(searchTerm)
                                               .Size(size)));

And I would like to see if it would be possible to write something that matches my requirement using SuggestCompletion (and not by doing a match query).

Many thanks,

Update: This question already has an answer here but I leave it here since the title/description is probably a little easier to search by search engines.

The correct solution to this problem can be found here: Elasticsearch NEST client creating multi-field fields with completion

danvasiloiu danvasiloiu · Accepted Answer · 2015-06-15T16:33:55

@Kha i think it's better to use the NGram Tokenizer

So you should use this tokenizer when you create the mapping. If you want more info, and maybe an example write back.

ElasticSearch Nest AutoComplete based on words split by whitespace

1 Answers