On Mon, May 1, 2017 at 3:55 PM, Serkan Mulayim <[email protected]> wrote:
> I am using the C library. I would like to get the suggester or autocomplete
> functionality in my library. It needs to return {"hello", "hell", "hellx"}
> when your query is "hell". I feel like I need to be able to read all the
> tokens in the whole index, and return the results based on it. I looked at
> the indexReader for this, but I could not find any useful information. Do
> you think this is possible?
Autosuggestion functionality will need tuning, just like search results. In
fact, autosuggestion is really a specialized form of search application. It
could be implemented with a separate index or separate fields.
Say that we only wanted to offer suggestions derived from the `title` field.
Split each title into an array of words. Then for each word, index starting
at some letter, say the third. For the title `hello world`, you'd get the
following tokens:
hello -> hel hell hello
world -> wor worl world
Then at search time, perform a search query with every keystroke.
h -> (no result)
he -> (no result)
hel -> "hello world"
Once you've got basic functionality running, experiment with minimum token
length, adding Soundex/Metaphone, performing character normalization, etc.
Marvin Humphrey
