How to boost search based on index type in elasticsearch or lucene?

Question

I have three food type indices \"Italian\", \"Spanish\", \"American\". When the user searches \"Cheese\", documents from \"Italian\" appear to come up at the top. Is it poss

Answer 1

For query-time boosting, queries (ex. query string) generally have a boost attribute you can set. Alternatively, you can wrap queries in a custom boost factor. I would probably prefer the former, usually.

Answer 2

If querying several indices at once, it is possible to specify indices boost at the top level of object passed to Search API:

curl -XGET localhost:9200/italian,spanish,american/_search -d '
{
    "query":{"term":{"food_type":"cheese"}},
    "indices_boost" : {
        "ilalian" : 1.4,
        "spanish" : 1.3,
        "american" : 1.1
    }
}'

http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-request-index-boost.html#search-request-index-boost

Answer 3

Use a script_score as part of the function score query:

function_score: {
  script_score: {
    script: "doc['_type'].value == '<your _type>' ? _score * <boost_factor> : _score"
  }
}

Answer 4

Add a term query with a boost for either the _type field or the _index (or both).