How to boost index type in elasticsearch?

问题

I used to search like this: curl -XGET localhost:9200/users/_search

but users contains user a,b,c like this: curl -XGET localhost:9200/users/a,b,c/_search

users is the first index, a/b/c is type.

How to boost type a in this query? Best with sample code, thanks.

回答1:

You can boost index types using terms query.

First Create some test data (e1,e2,e3 are types and test is the index name):

PUT test/e1/1
{
  "subject": "subject 1"
}
PUT test/e2/1
{
  "subject": "subject 1"
}
PUT test/e3/1
{
  "subject": "subject 1"
}

Now using term query with custom boost by type:

GET test/_search
{
  "query": {
    "bool": {
      "should": [
        {
         "query_string": {
           "query": "subject"
         }
        },
        { "term" : { "_type" : {"value" : "e3", "boost" : 2.0} } },
        { "term" : { "_type" : {"value" : "e2", "boost" : 3.0} } }
      ]
    }
  }
}

Which will generate the result like:

{
   "took": 1,
   "timed_out": false,
   "_shards": {
      "total": 1,
      "successful": 1,
      "failed": 0
   },
   "hits": {
      "total": 3,
      "max_score": 0.7671045,
      "hits": [
         {
            "_index": "test",
            "_type": "e2",
            "_id": "1",
            "_score": 0.7671045,
            "_source": {
               "subject": "subject 1"
            }
         },
         {
            "_index": "test",
            "_type": "e3",
            "_id": "1",
            "_score": 0.59740055,
            "_source": {
               "subject": "subject 1"
            }
         },
         {
            "_index": "test",
            "_type": "e1",
            "_id": "1",
            "_score": 0.1289963,
            "_source": {
               "subject": "subject 1"
            }
         }
      ]
   }
}

来源：https://stackoverflow.com/questions/29861330/how-to-boost-index-type-in-elasticsearch