Multiple searches with FOSElasticaBundle for a keyword

Question

How to search with original keyword and transformed keyword? I have indexed data like this with Elastica:

id1: {
    content: "Phòng tránh rủi ro",
    content_canonical: "Phong tranh rui ro"
},
id2: {
    content: "Phóng nhanh vượt ẩu",
    content_canonical: "Phong nhanh vuot au"
},
id3: {
    content: "Mô phỏng thực tế",
    content_canonical: "Mo phong thuc te"
}

Now, when people want to search for keyword phòng, I want to search for keyword phong (transformed from phòng) as well but the former should be scored higher than the latter.

How to do it with FOSElasticaBundle or with ElasticSearch?

Answer 1

Just found a solution:

                analysis:
                    analyzer:
                        post_analyzer:
                            tokenizer: lowercase
                            filter: [ standard, my_ascii_folding ]
                    filter:
                        my_ascii_folding:
                            type: asciifolding
                            preserve_original: true

Then post_analyzer need to be applied to the fields content. And content_canonical is not needed as asciifolding will do it automatically.