Question

I have certain document which stores the brand names in analysed form for ex: {“name”:”Samsung”}
{“name”:”Motion Systems”}. There are cases where i would want a term search starting with “s” which should result in both the documents. and another case where i want only the complete field starting with “s” query which results in only “samsung” returned.
I have analysed the name field and stored it. Is there any way in which i can do the complete field starting with query in elastic search?

Answer 1

You should index your field in two different ways using a multi_field. If you tokenize it as you already do you have a match based on the tokens produced by the tokenizer. For the second tye of match that you want you need to either disable analyzing the field and indexing it as it is, or use the Keywork tokenizer which produce the same result. Your mapping would look like this:

{
    "your_type" : {
        "properties" : {
            "brand" : {
                "type" : "multi_field",
                "fields" : {
                    "brand" : {"type" : "string", "index" : "analyzed"},
                    "untouched" : {"type" : "string", "index" : "not_analyzed"}
                }
            }
        }
    }
}

Then you can search on both fields. When you search on brand you get the matches that you already have, while searching on brand.untouched you would get the second tye of matches.
There are different ways to put together multiple queries, you can have a look for instance at the bool query.