Reduce the number of results returned in elasticsearch

I am using an ngram analyzer for doing auto complete search on a particular
field using elasticsearch.
By default I have set the number of results to return to 10 using "size:10"
inside the query.

But what I want is that as my search nears the exact match, the results
returned by elastic search should reduce

For example
If searching for: "fl"
Will return : "flake", "flower", "fleet", "flank", "flatter".

If searching for: "fla"
Will return : "flan","flank", "flatter".

If searching for: "flan"
Will return : "flan","flank".

Right now all results are returned even if i search for "flan"
I am also using phonetic search.

Regards,
Soumya

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You probably want to override the search_analyzer to make sure that the
ngram is not applied to your query string. For example, if you use the
match query, just set analyzer in your query to something like standard.

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